Adding upstream version 4.96.upstream/4.96upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

88 files changed, 4962 insertions, 0 deletions

diff --git a/OS/Makefile-Base b/OS/Makefile-Base
new file mode 100644
index 0000000..78f5516
--- /dev/null
+++ b/OS/Makefile-Base
@@ -0,0 +1,995 @@
+# This file is the basis of the main makefile for Exim and friends. The
+# makefile at the top level arranges to build the main makefile by calling
+# scripts/Configure-Makefile from within the build directory. This
+# concatenates the configuration settings from Local/Makefile and other,
+# optional, Local/* files at the front of this file, to create Makefile in the
+# build directory.
+#
+# Copyright (c) The Exim Maintainers 1995 - 2022
+
+SHELL      = $(MAKE_SHELL)
+SCRIPTS    = ../scripts
+O          = ../OS
+EDITME     = ../Local/Makefile
+EXIMON_EDITME = ../Local/eximon.conf
+
+# The compiler used for linking is normally the same as the compiler used for
+# compiling. However, by giving it a different name, we can override it from
+# the command line, and this is helpful for certain types of testing.
+
+LNCC = $(CC)
+
+# The compile commands can be very long. To make the output look better,
+# they are not normally echoed in full. To get full echoing, the caller
+# must set FULLECHO='' on the command line and call make with -e. We default
+# FULLECHO to '@' to suppress the full echo. Then define an abbreviation.
+
+FULLECHO = @
+FE       = $(FULLECHO)
+
+# The default target double-checks the existence of $(EDITME) and then arranges
+# to touch it if it exists and any of the optional configuration files, which
+# depend on the os or the architecture, have been altered. The same sub-target
+# does the same thing for the eximon configuration file if it exists. Then
+# there is a check that the Makefile (the one built from this file) is
+# up-to-date. Then the os-specific source files and the C configuration file
+# are set up, and finally it goes to the main Exim target.
+
+all:       utils exim
+config:    $(EDITME) checklocalmake Makefile os.c config.h version.h version.sh macro.c
+
+checklocalmake:
+	@if $(SHELL) $(SCRIPTS)/newer $(EDITME)-$(OSTYPE) $(EDITME) || \
+	  $(SHELL) $(SCRIPTS)/newer $(EDITME)-$(ARCHTYPE) $(EDITME) || \
+	  $(SHELL) $(SCRIPTS)/newer $(EDITME)-$(OSTYPE)-$(ARCHTYPE) $(EDITME); \
+	then \
+	  touch $(EDITME); \
+	fi
+	@if $(SHELL) $(SCRIPTS)/newer $(EXIMON_EDITME)-$(OSTYPE) $(EXIMON_EDITME) || \
+	  $(SHELL) $(SCRIPTS)/newer $(EXIMON_EDITME)-$(ARCHTYPE) $(EXIMON_EDITME) || \
+	  $(SHELL) $(SCRIPTS)/newer $(EXIMON_EDITME)-$(OSTYPE)-$(ARCHTYPE) $(EXIMON_EDITME); \
+	then \
+	  if [ -f $(EXIMON_EDITME) ]; then touch $(EXIMON_EDITME); fi \
+	fi
+
+$(EDITME):
+	@echo " "
+	@echo "*** Please create Local/Makefile by copying src/EDITME and making"
+	@echo "*** appropriate changes for your site."
+	@echo " "
+	@false
+
+$(EXIMON_EDITME):
+	@echo " "
+	@echo "*** Please create Local/eximon.conf by copying exim_monitor/EDITME and making"
+	@echo "*** appropriate changes for your site."
+	@echo " "
+	@test ! -d ../Local && mkdir ../Local
+	@false
+
+# Check that the local Makefile is up-to-date
+
+Makefile: ../OS/Makefile-Base ../OS/Makefile-Default \
+          $(SCRIPTS)/Configure $(SCRIPTS)/Configure-Makefile $(EDITME)
+	@echo " "
+	@echo "*** Makefile needs rebuilding"
+	@echo "*** Please run \"make makefile\" at top level"
+	@echo " "
+	@false
+
+# Build (link) the os.h file
+
+os.h:	$(SCRIPTS)/Configure-os.h \
+	$(O)/os.h-FreeBSD	\
+	$(O)/os.h-GNU		\
+	$(O)/os.h-Linux		\
+	$(O)/os.h-OpenBSD	\
+	$(O)/os.h-SunOS5
+	$(SHELL) $(SCRIPTS)/Configure-os.h
+
+# Build the os.c file
+
+os.c:   ../src/os.c \
+	$(SCRIPTS)/Configure-os.c \
+	$(O)/os.c-FreeBSD	\
+	$(O)/os.c-GNU		\
+	$(O)/os.c-Linux		\
+	$(O)/os.c-SunOS5
+	$(SHELL) $(SCRIPTS)/Configure-os.c
+
+# Build the config.h file.
+
+config.h: Makefile buildconfig ../src/config.h.defaults $(EDITME)
+	$(SHELL) $(SCRIPTS)/Configure-config.h "$(MAKE)"
+
+# Build the builtin-macros data struct
+
+MACRO_HSRC = macro_predef.h os.h globals.h config.h macros.h \
+	routers/accept.h routers/dnslookup.h routers/ipliteral.h \
+	routers/iplookup.h routers/manualroute.h routers/queryprogram.h \
+	routers/redirect.h
+
+OBJ_MACRO = macro_predef.o \
+	macro-globals.o macro-readconf.o macro-route.o macro-transport.o macro-drtables.o \
+	macro-acl.o macro-tls.o \
+	macro-appendfile.o macro-autoreply.o macro-lmtp.o macro-pipe.o macro-queuefile.o \
+	macro-smtp.o macro-accept.o macro-dnslookup.o macro-ipliteral.o macro-iplookup.o \
+	macro-manualroute.o macro-queryprogram.o macro-redirect.o \
+	macro-auth-spa.o macro-cram_md5.o macro-cyrus_sasl.o macro-dovecot.o macro-gsasl_exim.o \
+	macro-heimdal_gssapi.o macro-plaintext.o macro-spa.o macro-authtls.o macro-external.o \
+	macro-dkim.o macro-malware.o macro-signing.o
+
+$(OBJ_MACRO):	$(MACRO_HSRC)
+
+macro_predef.o :	macro_predef.c
+	@echo "$(CC) -DMACRO_PREDEF macro_predef.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ macro_predef.c
+macro-globals.o :	globals.c
+	@echo "$(CC) -DMACRO_PREDEF globals.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ globals.c
+macro-readconf.o :	readconf.c
+	@echo "$(CC) -DMACRO_PREDEF readconf.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ readconf.c
+macro-route.o :		route.c
+	@echo "$(CC) -DMACRO_PREDEF route.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ route.c
+macro-transport.o:	transport.c
+	@echo "$(CC) -DMACRO_PREDEF transport.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transport.c
+macro-drtables.o :	drtables.c
+	@echo "$(CC) -DMACRO_PREDEF drtables.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ drtables.c
+macro-acl.o:	acl.c
+	@echo "$(CC) -DMACRO_PREDEF acl.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ acl.c
+macro-tls.o:	tls.c tls-gnu.c tls-openssl.c
+	@echo "$(CC) -DMACRO_PREDEF tls.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ tls.c
+macro-appendfile.o :	transports/appendfile.c
+	@echo "$(CC) -DMACRO_PREDEF transports/appendfile.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/appendfile.c
+macro-autoreply.o :	transports/autoreply.c
+	@echo "$(CC) -DMACRO_PREDEF transports/autoreply.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/autoreply.c
+macro-lmtp.o:		transports/lmtp.c
+	@echo "$(CC) -DMACRO_PREDEF transports/lmtp.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/lmtp.c
+macro-pipe.o :		transports/pipe.c
+	@echo "$(CC) -DMACRO_PREDEF transports/pipe.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/pipe.c
+macro-queuefile.o :	transports/queuefile.c
+	@echo "$(CC) -DMACRO_PREDEF transports/queuefile.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/queuefile.c
+macro-smtp.o :		transports/smtp.c
+	@echo "$(CC) -DMACRO_PREDEF transports/smtp.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ transports/smtp.c
+macro-accept.o :	routers/accept.c
+	@echo "$(CC) -DMACRO_PREDEF routers/accept.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/accept.c
+macro-dnslookup.o :	routers/dnslookup.c
+	@echo "$(CC) -DMACRO_PREDEF routers/dnslookup.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/dnslookup.c
+macro-ipliteral.o :	routers/ipliteral.c
+	@echo "$(CC) -DMACRO_PREDEF routers/ipliteral.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/ipliteral.c
+macro-iplookup.o :	routers/iplookup.c
+	@echo "$(CC) -DMACRO_PREDEF routers/iplookup.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/iplookup.c
+macro-manualroute.o :	routers/manualroute.c
+	@echo "$(CC) -DMACRO_PREDEF routers/manualroute.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/manualroute.c
+macro-queryprogram.o :	routers/queryprogram.c
+	@echo "$(CC) -DMACRO_PREDEF routers/queryprogram.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/queryprogram.c
+macro-redirect.o :	routers/redirect.c
+	@echo "$(CC) -DMACRO_PREDEF routers/redirect.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ routers/redirect.c
+macro-auth-spa.o :	auths/auth-spa.c
+	@echo "$(CC) -DMACRO_PREDEF auths/auth-spa.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/auth-spa.c
+macro-cram_md5.o :	auths/cram_md5.c
+	@echo "$(CC) -DMACRO_PREDEF auths/cram_md5.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/cram_md5.c
+macro-cyrus_sasl.o :	auths/cyrus_sasl.c
+	@echo "$(CC) -DMACRO_PREDEF auths/cyrus_sasl.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/cyrus_sasl.c
+macro-dovecot.o:	auths/dovecot.c
+	@echo "$(CC) -DMACRO_PREDEF auths/dovecot.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/dovecot.c
+macro-external.o:	auths/external.c
+	@echo "$(CC) -DMACRO_PREDEF auths/external.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/external.c
+macro-gsasl_exim.o :	auths/gsasl_exim.c
+	@echo "$(CC) -DMACRO_PREDEF auths/gsasl_exim.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/gsasl_exim.c
+macro-heimdal_gssapi.o:	auths/heimdal_gssapi.c
+	@echo "$(CC) -DMACRO_PREDEF auths/heimdal_gssapi.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/heimdal_gssapi.c
+macro-plaintext.o :	auths/plaintext.c
+	@echo "$(CC) -DMACRO_PREDEF auths/plaintext.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/plaintext.c
+macro-spa.o :		auths/spa.c
+	@echo "$(CC) -DMACRO_PREDEF auths/spa.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/spa.c
+macro-authtls.o:	auths/tls.c
+	@echo "$(CC) -DMACRO_PREDEF auths/tls.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ auths/tls.c
+macro-dkim.o:		dkim.c
+	@echo "$(CC) -DMACRO_PREDEF dkim.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ dkim.c
+macro-malware.o:	malware.c
+	@echo "$(CC) -DMACRO_PREDEF malware.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ malware.c
+macro-signing.o:	pdkim/signing.c
+	@echo "$(CC) -DMACRO_PREDEF pdkim/signing.c"
+	$(FE)$(CC) -c $(CFLAGS) -DMACRO_PREDEF $(INCLUDE) -o $@ pdkim/signing.c
+
+macro_predef: $(OBJ_MACRO)
+	@echo "$(LNCC) -o $@"
+	$(FE)$(LNCC) -o $@ $(LFLAGS) $(OBJ_MACRO)
+
+macro.c: macro_predef
+	./macro_predef > macro.c
+
+# This target is recognized specially by GNU make. It records those targets
+# that do not correspond to files that are being built and which should
+# therefore always be run, even if the files exist. This shouldn't in fact be a
+# problem, but it does no harm. Other make programs will just ignore this.
+
+.PHONY: all config utils \
+	buildauths buildlookups buildpdkim buildrouters \
+        buildtransports checklocalmake clean
+
+
+utils: $(EXIM_MONITOR) exicyclog exinext exiwhat \
+        exigrep eximstats exipick exiqgrep exiqsumm \
+        transport-filter.pl convert4r3 convert4r4 \
+        exim_checkaccess \
+        exim_dbmbuild exim_dumpdb exim_fixdb exim_tidydb exim_lock
+
+
+# Targets for special-purpose configuration header builders
+buildconfig: buildconfig.c
+	@echo "$(CC) buildconfig.c"
+	$(FE)$(CC) $(CFLAGS) $(INCLUDE) -o buildconfig buildconfig.c $(LIBS)
+
+
+# Target for the exicyclog utility script
+exicyclog: config ../src/exicyclog.src
+	@rm -f exicyclog
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?CONFIGURE_FILE_USE_NODE?$(CONFIGURE_FILE_USE_NODE)?" \
+	  -e "s?CONFIGURE_FILE_USE_EUID?$(CONFIGURE_FILE_USE_EUID)?" \
+	  -e "s?CONFIGURE_FILE?$(CONFIGURE_FILE)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?EXICYCLOG_MAX?$(EXICYCLOG_MAX)?" \
+	  -e "s?COMPRESS_COMMAND?$(COMPRESS_COMMAND)?" \
+	  -e "s?COMPRESS_SUFFIX?$(COMPRESS_SUFFIX)?" \
+	  -e "s?CHGRP_COMMAND?$(CHGRP_COMMAND)?" \
+	  -e "s?CHMOD_COMMAND?$(CHMOD_COMMAND)?" \
+	  -e "s?CHOWN_COMMAND?$(CHOWN_COMMAND)?" \
+	  -e "s?MV_COMMAND?$(MV_COMMAND)?" \
+	  -e "s?RM_COMMAND?$(RM_COMMAND)?" \
+	  -e "s?TOUCH_COMMAND?$(TOUCH_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exicyclog.src > exicyclog-t
+	@mv exicyclog-t exicyclog
+	@chmod a+x exicyclog
+	@echo ">>> exicyclog script built"
+
+# Target for the exinext utility script
+exinext: config ../src/exinext.src
+	@rm -f exinext
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?CONFIGURE_FILE_USE_NODE?$(CONFIGURE_FILE_USE_NODE)?" \
+	  -e "s?CONFIGURE_FILE?$(CONFIGURE_FILE)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exinext.src > exinext-t
+	@mv exinext-t exinext
+	@chmod a+x exinext
+	@echo ">>> exinext script built"
+
+# Target for the exiwhat utility script
+exiwhat: config ../src/exiwhat.src
+	@rm -f exiwhat
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?CONFIGURE_FILE_USE_NODE?$(CONFIGURE_FILE_USE_NODE)?" \
+	  -e "s?CONFIGURE_FILE?$(CONFIGURE_FILE)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?EXIWHAT_PS_CMD?$(EXIWHAT_PS_CMD)?" \
+	  -e "s?EXIWHAT_PS_ARG?$(EXIWHAT_PS_ARG)?" \
+	  -e "s?EXIWHAT_KILL_SIGNAL?$(EXIWHAT_KILL_SIGNAL)?" \
+	  -e "s?EXIWHAT_EGREP_ARG?$(EXIWHAT_EGREP_ARG)?" \
+	  -e "s?EXIWHAT_MULTIKILL_CMD?$(EXIWHAT_MULTIKILL_CMD)?" \
+	  -e "s?EXIWHAT_MULTIKILL_ARG?$(EXIWHAT_MULTIKILL_ARG)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  -e "s?RM_COMMAND?$(RM_COMMAND)?" \
+	  ../src/exiwhat.src > exiwhat-t
+	@mv exiwhat-t exiwhat
+	@chmod a+x exiwhat
+	@echo ">>> exiwhat script built"
+
+# Target for the exim_checkaccess utility script
+exim_checkaccess: config ../src/exim_checkaccess.src
+	@rm -f exim_checkaccess
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?CONFIGURE_FILE_USE_NODE?$(CONFIGURE_FILE_USE_NODE)?" \
+	  -e "s?CONFIGURE_FILE?$(CONFIGURE_FILE)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exim_checkaccess.src > exim_checkaccess-t
+	@mv exim_checkaccess-t exim_checkaccess
+	@chmod a+x exim_checkaccess
+	@echo ">>> exim_checkaccess script built"; echo ""
+
+# Target for the Exim monitor start-up script
+eximon: config ../src/eximon.src ../OS/eximon.conf-Default \
+          ../Local/eximon.conf
+	@rm -f eximon
+	$(SHELL) $(SCRIPTS)/Configure-eximon
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?CONFIGURE_FILE_USE_NODE?$(CONFIGURE_FILE_USE_NODE)?" \
+	  -e "s?CONFIGURE_FILE?$(CONFIGURE_FILE)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?BASENAME_COMMAND?$(BASENAME_COMMAND)?" \
+	  -e "s?HOSTNAME_COMMAND?$(HOSTNAME_COMMAND)?" \
+	  -e "s?X11_LD_LIBRARY?$(X11_LD_LIB)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/eximon.src >> eximon
+	@echo ">>> eximon script built"; echo ""
+
+# Targets for utilities; these are all Perl scripts that have to get the
+# location of Perl put in them. A few need other things as well.
+
+exigrep: config ../src/exigrep.src
+	@rm -f exigrep
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?ZCAT_COMMAND?$(ZCAT_COMMAND)?" \
+          -e "s?COMPRESS_SUFFIX?$(COMPRESS_SUFFIX)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exigrep.src > exigrep-t
+	@mv exigrep-t exigrep
+	@chmod a+x exigrep
+	@echo ">>> exigrep script built"
+
+eximstats: config ../src/eximstats.src
+	@rm -f eximstats
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/eximstats.src > eximstats-t
+	@mv eximstats-t eximstats
+	@chmod a+x eximstats
+	@echo ">>> eximstats script built"
+
+exiqgrep: config ../src/exiqgrep.src
+	@rm -f exiqgrep
+	@. ./version.sh && sed \
+	  -e "s?PROCESSED_FLAG?This file has been so processed.?"\
+	  -e "/^# /p" \
+	  -e "/^# /d" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exiqgrep.src > exiqgrep-t
+	@mv exiqgrep-t exiqgrep
+	@chmod a+x exiqgrep
+	@echo ">>> exiqgrep script built"
+
+exiqsumm: config ../src/exiqsumm.src
+	@rm -f exiqsumm
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exiqsumm.src > exiqsumm-t
+	@mv exiqsumm-t exiqsumm
+	@chmod a+x exiqsumm
+	@echo ">>> exiqsumm script built"
+
+exipick: config ../src/exipick.src
+	@rm -f exipick
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?SPOOL_DIRECTORY?$(SPOOL_DIRECTORY)?" \
+	  -e "s?BIN_DIRECTORY?$(BIN_DIRECTORY)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/exipick.src > exipick-t
+	@mv exipick-t exipick
+	@chmod a+x exipick
+	@echo ">>> exipick script built"
+
+transport-filter.pl: config ../src/transport-filter.src
+	@rm -f transport-filter.pl
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/transport-filter.src > transport-filter.pl-t
+	@mv transport-filter.pl-t transport-filter.pl
+	@chmod a+x transport-filter.pl
+	@echo ">>> transport-filter.pl script built"
+
+convert4r3: config ../src/convert4r3.src
+	@rm -f convert4r3
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/convert4r3.src > convert4r3-t
+	@mv convert4r3-t convert4r3
+	@chmod a+x convert4r3
+	@echo ">>> convert4r3 script built"
+
+convert4r4: config ../src/convert4r4.src
+	@rm -f convert4r4
+	@. ./version.sh && sed \
+	  -e "s?PERL_COMMAND?$(PERL_COMMAND)?" \
+	  -e "s?EXIM_RELEASE_VERSION?$${EXIM_RELEASE_VERSION}?" \
+	  -e "s?EXIM_VARIANT_VERSION?$${EXIM_VARIANT_VERSION}?" \
+	  ../src/convert4r4.src > convert4r4-t
+	@mv convert4r4-t convert4r4
+	@chmod a+x convert4r4
+	@echo ">>> convert4r4 script built"
+
+
+# These are objects of optional features. They are always compiled, but
+# if the corresponding #defines are not set, they wind up empty and
+# are thrown away by the linker.
+
+OBJ_WITH_CONTENT_SCAN = malware.o mime.o regex.o spam.o spool_mbox.o
+OBJ_EXPERIMENTAL =	arc.o \
+			bmi_spam.o \
+			dane.o \
+			dcc.o \
+			dmarc.o \
+			imap_utf7.o \
+			spf.o \
+			utf8.o
+
+# Targets for final binaries; the main one has a build number which is
+# updated each time. We don't bother with that for the auxiliaries.
+
+OBJ_LOOKUPS = lookups/lf_quote.o lookups/lf_check_file.o lookups/lf_sqlperform.o
+
+OBJ_EXIM = acl.o base64.o child.o crypt16.o daemon.o dbfn.o debug.o deliver.o \
+        directory.o dns.o drtables.o enq.o exim.o expand.o filter.o \
+        filtertest.o globals.o dkim.o dkim_transport.o dnsbl.o hash.o \
+        header.o host.o ip.o log.o lss.o match.o md5.o moan.o \
+        os.o parse.o priv.o queue.o \
+        rda.o readconf.o receive.o retry.o rewrite.o rfc2047.o \
+        route.o search.o sieve.o smtp_in.o smtp_out.o spool_in.o spool_out.o \
+        std-crypto.o store.o string.o tls.o tod.o transport.o tree.o verify.o \
+        environment.o macro.o \
+        $(OBJ_LOOKUPS) \
+        local_scan.o $(EXIM_PERL) $(OBJ_WITH_CONTENT_SCAN) \
+        $(OBJ_EXPERIMENTAL)
+
+exim:   buildlookups buildauths pdkim/pdkim.a \
+        buildrouters buildtransports \
+        $(OBJ_EXIM) version.o
+	@echo "$(LNCC) -o exim"
+	$(FE)$(PURIFY) $(LNCC) -o exim $(LFLAGS) $(OBJ_EXIM) version.o \
+	  routers/routers.a transports/transports.a lookups/lookups.a \
+	  auths/auths.a pdkim/pdkim.a \
+	  $(LIBRESOLV) $(LIBS) $(LIBS_EXIM) $(IPV6_LIBS) $(EXTRALIBS) \
+	  $(EXTRALIBS_EXIM) $(DBMLIB) $(LOOKUP_LIBS) $(AUTH_LIBS) \
+	  $(PERL_LIBS) $(TLS_LIBS) $(PCRE_LIBS) $(LDFLAGS)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim; \
+	  $(STRIP_COMMAND) exim; \
+	fi
+	$(EXIM_CHMOD)
+	@echo " "
+	@echo ">>> exim binary built"
+	@echo " "
+
+# The utility for dumping the contents of an exim database
+
+OBJ_DUMPDB = exim_dumpdb.o util-os.o util-store.o
+
+exim_dumpdb: $(OBJ_DUMPDB)
+	@echo "$(LNCC) -o exim_dumpdb"
+	$(FE)$(LNCC) $(CFLAGS) $(INCLUDE) -o exim_dumpdb $(LFLAGS) $(OBJ_DUMPDB) \
+	  $(LIBS) $(EXTRALIBS) $(DBMLIB)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim_dumpdb; \
+	  $(STRIP_COMMAND) exim_dumpdb; \
+	fi
+	@echo ">>> exim_dumpdb utility built"
+	@echo " "
+
+# The utility for interrogating/fixing the contents of an exim database
+
+OBJ_FIXDB = exim_fixdb.o util-os.o util-store.o util-md5.o
+
+exim_fixdb:  $(OBJ_FIXDB)
+	@echo "$(LNCC) -o exim_fixdb"
+	$(FE)$(LNCC) $(CFLAGS) $(INCLUDE) -o exim_fixdb $(LFLAGS) $(OBJ_FIXDB) \
+	  $(LIBS) $(EXTRALIBS) $(DBMLIB)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim_fixdb; \
+	  $(STRIP_COMMAND) exim_fixdb; \
+	fi
+	@echo ">>> exim_fixdb utility built"
+	@echo " "
+
+# The utility for tidying the contents of an exim database
+
+OBJ_TIDYDB = exim_tidydb.o util-os.o util-store.o
+
+exim_tidydb: $(OBJ_TIDYDB)
+	@echo "$(LNCC) -o exim_tidydb"
+	$(FE)$(LNCC) $(CFLAGS) $(INCLUDE) -o exim_tidydb $(LFLAGS) $(OBJ_TIDYDB) \
+	  $(LIBS) $(EXTRALIBS) $(DBMLIB)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim_tidydb; \
+	  $(STRIP_COMMAND) exim_tidydb; \
+	fi
+	@echo ">>> exim_tidydb utility built"
+	@echo " "
+
+# The utility for building dbm files
+
+exim_dbmbuild: exim_dbmbuild.o
+	@echo "$(LNCC) -o exim_dbmbuild"
+	$(FE)$(LNCC) $(CFLAGS) $(INCLUDE) -o exim_dbmbuild $(LFLAGS) exim_dbmbuild.o \
+	  $(LIBS) $(EXTRALIBS) $(DBMLIB)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim_dbmbuild; \
+	  $(STRIP_COMMAND) exim_dbmbuild; \
+	fi
+	@echo ">>> exim_dbmbuild utility built"
+	@echo " "
+
+# The utility for locking a mailbox while messing around with it
+
+exim_lock: exim_lock.c os.h
+	@echo "$(CC) exim_lock.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) exim_lock.c
+	@echo "$(LNCC) -o exim_lock"
+	$(FE)$(LNCC) -o exim_lock $(LFLAGS) exim_lock.o  \
+	  $(LIBS) $(EXTRALIBS)
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) exim_lock; \
+	  $(STRIP_COMMAND) exim_lock; \
+	fi
+	@echo ">>> exim_lock utility built"
+	@echo " "
+
+# The X-based Exim monitor program's binary part. There's a macro for cutting
+# out the modified TextPop module, because some antique link editors cannot
+# handle the fact that it is redefining things that are found later in the
+# Xaw library.
+
+# Object modules that are the unique Eximon modules
+
+MONBIN = em_StripChart.o $(EXIMON_TEXTPOP) em_globals.o em_init.o \
+	em_log.o em_main.o em_menu.o em_queue.o em_strip.o \
+	em_text.o em_xs.o
+
+# The complete modules list also includes some specially compiled versions of
+# code from the main Exim source tree.
+
+OBJ_MONBIN = util-spool_in.o \
+	     util-store.o \
+	     util-string.o \
+	     util-queue.o \
+	     util-tod.o \
+	     util-tree.o \
+	     $(MONBIN)
+
+eximon.bin: $(EXIMON_EDITME) eximon $(OBJ_MONBIN) ../exim_monitor/em_version.c \
+		mytypes.h store.h macros.h
+	@echo "$(CC) exim_monitor/em_version.c"
+	$(FE)$(CC) -o em_version.o -c \
+	  $(CFLAGS) $(XINCLUDE) -I. ../exim_monitor/em_version.c
+	@echo "$(LNCC) -o eximon.bin"
+	$(FE)$(PURIFY) $(LNCC) -o eximon.bin em_version.o $(LFLAGS) $(XLFLAGS) \
+	  $(OBJ_MONBIN) -lXaw -lXmu -lXt -lXext -lX11 $(PCRE_LIBS) \
+	  $(LIBS) $(LIBS_EXIMON) $(EXTRALIBS) $(EXTRALIBS_EXIMON) -lc
+	@if [ x"$(STRIP_COMMAND)" != x"" ]; then \
+	  echo $(STRIP_COMMAND) eximon.bin; \
+	  $(STRIP_COMMAND) eximon.bin; \
+	fi
+	@echo ">>> exim monitor binary built"
+	@echo " "
+
+
+# Compile step for most of the exim modules. HDRS is a list of headers
+# which cause everything to be rebuilt. PHDRS is the same, for the use
+# of routers, transports, and authenticators. I can't find a way of doing this
+# in one. This list is overkill, but it doesn't really take much time to
+# rebuild Exim on a modern computer.
+
+HDRS  =	blob.h \
+	config.h \
+	dbfunctions.h \
+	exim.h \
+	functions.h \
+	globals.h \
+	hash.h \
+	hintsdb.h \
+	hintsdb_structs.h \
+	local_scan.h \
+	macros.h \
+	mytypes.h \
+	sha_ver.h \
+	structs.h \
+	os.h
+PHDRS = ../config.h \
+	../dbfunctions.h \
+	../exim.h \
+	../functions.h \
+	../globals.h \
+	../hintsdb.h \
+	../hintsdb_structs.h \
+	../local_scan.h \
+	../macros.h \
+	../mytypes.h \
+	../structs.h \
+	../os.h
+
+.SUFFIXES: .o .c
+.c.o:;  @echo "$(CC) $*.c"
+	$(FE)$(CC) -c $(CFLAGS) -I. $(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE) $*.c
+
+# Update Exim's version information and build the version object.  The dependency
+# chain here avoids problems under parallel-make.
+
+version.sh:
+	@../scripts/reversion
+
+version.h: version.sh
+
+cnumber.h: version.h
+
+version.o: $(HDRS) cnumber.h version.h version.c
+
+# This is the dummy module for use by test compiles of individual modules. It
+# contains functions such as log_write() that may be called from bits of Exim
+# in the tested code.
+
+dummies.o:       dummies.c
+
+# Compile instructions for perl.o for when EXIM_PERL is set
+
+perl.o:          $(HDRS) perl.c
+	@echo "$(PERL_CC) perl.c"
+	$(FE)$(PERL_CC) $(PERL_CCOPTS) $(CFLAGS) $(INCLUDE) -c perl.c
+
+# Compile instructions for the database utility modules
+
+exim_dumpdb.o:   $(HDRS) exim_dbutil.c
+	@echo "$(CC) -DEXIM_DUMPDB exim_dbutil.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) \
+				      -DCOMPILE_UTILITY \
+				      -DEXIM_DUMPDB \
+				      -o exim_dumpdb.o exim_dbutil.c
+
+exim_fixdb.o:    $(HDRS) exim_dbutil.c
+	@echo "$(CC) -DEXIM_FIXDB exim_dbutil.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) \
+				      -DCOMPILE_UTILITY \
+				      -DEXIM_FIXDB \
+				      -o exim_fixdb.o exim_dbutil.c
+
+exim_tidydb.o:   $(HDRS) exim_dbutil.c
+	@echo "$(CC) -DEXIM_TIDYDB exim_dbutil.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) \
+				      -DCOMPILE_UTILITY \
+				      -DEXIM_TIDYDB \
+				      -o exim_tidydb.o exim_dbutil.c
+
+# Compile instructions for exim_dbmbuild
+
+exim_dbmbuild.o: $(HDRS) exim_dbmbuild.c
+	@echo "$(CC) exim_dbmbuild.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY \
+		-o exim_dbmbuild.o exim_dbmbuild.c
+
+# Utilities use special versions of some modules - typically with debugging
+# calls cut out.
+
+util-spool_in.o: $(HDRS) spool_in.c
+	@echo "$(CC) -DCOMPILE_UTILITY spool_in.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-spool_in.o spool_in.c
+
+util-store.o:    $(HDRS) store.c
+	@echo "$(CC) -DCOMPILE_UTILITY store.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-store.o store.c
+
+util-string.o:   $(HDRS) string.c
+	@echo "$(CC) -DCOMPILE_UTILITY string.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-string.o string.c
+
+util-md5.o:   $(HDRS) md5.c
+	@echo "$(CC) -DCOMPILE_UTILITY queue.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-md5.o md5.c
+
+util-queue.o:   $(HDRS) queue.c
+	@echo "$(CC) -DCOMPILE_UTILITY queue.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-queue.o queue.c
+
+util-tod.o:   $(HDRS) tod.c
+	@echo "$(CC) -DCOMPILE_UTILITY tod.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-tod.o tod.c
+
+util-tree.o:   $(HDRS) tree.c
+	@echo "$(CC) -DCOMPILE_UTILITY tree.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY -o util-tree.o tree.c
+
+util-os.o:       $(HDRS) os.c
+	@echo "$(CC) -DCOMPILE_UTILITY os.c"
+	$(FE)$(CC) -c $(CFLAGS) $(INCLUDE) \
+				      -DCOMPILE_UTILITY \
+				      -DOS_LOAD_AVERAGE \
+				      -DFIND_RUNNING_INTERFACES \
+				      -o util-os.o os.c
+
+# The local scan module depends only on its own special header, and is compiled
+# from a source whose location is set by configuration.
+
+local_scan.o:    config local_scan.h ../$(LOCAL_SCAN_SOURCE)
+	@echo "$(CC) local_scan.c"
+	$(FE)$(CC) -DLOCAL_SCAN -c $(CFLAGS) -I. $(INCLUDE) -o local_scan.o ../$(LOCAL_SCAN_SOURCE)
+
+# Dependencies for the "ordinary" exim modules
+
+acl.o:           $(HDRS) acl.c
+base64.o:        $(HDRS) mime.h base64.c
+child.o:         $(HDRS) child.c
+crypt16.o:       $(HDRS) crypt16.c
+daemon.o:        $(HDRS) daemon.c
+dbfn.o:          $(HDRS) dbfn.c
+debug.o:         $(HDRS) debug.c
+deliver.o:       $(HDRS) transports/smtp.h deliver.c
+directory.o:     $(HDRS) directory.c
+dns.o:           $(HDRS) dns.c
+dnsbl.o:         $(HDRS) dnsbl.c
+enq.o:           $(HDRS) enq.c
+exim.o:          $(HDRS) exim.c
+expand.o:        $(HDRS) expand.c
+environment.o:   $(HDRS) environment.c
+filter.o:        $(HDRS) filter.c
+filtertest.o:    $(HDRS) filtertest.c
+globals.o:       $(HDRS) globals.c
+hash.o:          $(HDRS) hash.c
+header.o:        $(HDRS) header.c
+host.o:          $(HDRS) host.c
+ip.o:            $(HDRS) ip.c
+log.o:           $(HDRS) log.c
+lss.o:           $(HDRS) lss.c
+match.o:         $(HDRS) match.c
+md5.o:           $(HDRS) md5.c
+moan.o:          $(HDRS) moan.c
+os.o:            $(HDRS) $(OS_C_INCLUDES) os.c
+parse.o:         $(HDRS) parse.c
+priv.o:          $(HDRS) priv.c
+queue.o:         $(HDRS) queue.c
+rda.o:           $(HDRS) rda.c
+readconf.o:      $(HDRS) readconf.c
+receive.o:       $(HDRS) receive.c
+retry.o:         $(HDRS) retry.c
+rewrite.o:       $(HDRS) rewrite.c
+rfc2047.o:       $(HDRS) rfc2047.c
+route.o:         $(HDRS) route.c
+search.o:        $(HDRS) search.c
+sieve.o:         $(HDRS) sieve.c
+smtp_in.o:       $(HDRS) smtp_in.c
+smtp_out.o:      $(HDRS) smtp_out.c
+spool_in.o:      $(HDRS) spool_in.c
+spool_out.o:     $(HDRS) spool_out.c
+std-crypto.o:    $(HDRS) std-crypto.c
+store.o:         $(HDRS) store.c
+string.o:        $(HDRS) string.c
+tls.o:           $(HDRS) tls.c \
+		 tls-gnu.c tlscert-gnu.c \
+		 tls-openssl.c tlscert-openssl.c \
+		 tls-cipher-stdname.c
+tod.o:           $(HDRS) tod.c
+transport.o:     $(HDRS) transport.c
+tree.o:          $(HDRS) tree.c
+verify.o:        $(HDRS) transports/smtp.h verify.c
+dkim.o:          $(HDRS) pdkim/pdkim.h dkim.c
+dkim_transport.o: $(HDRS) dkim_transport.c
+
+# Dependencies for WITH_CONTENT_SCAN modules
+
+malware.o:       $(HDRS) malware.c
+mime.o:          $(HDRS) mime.h mime.c
+regex.o:         $(HDRS) regex.c
+spam.o:          $(HDRS) spam.c
+spool_mbox.o:    $(HDRS) spool_mbox.c
+
+
+# Dependencies for EXPERIMENTAL_* modules
+
+arc.o:		$(HDRS) pdkim/pdkim.h arc.c
+bmi_spam.o:	$(HDRS) bmi_spam.c
+dane.o:		$(HDRS) dane.c dane-openssl.c
+dcc.o:		$(HDRS) dcc.h dcc.c
+dmarc.o:	$(HDRS) pdkim/pdkim.h dmarc.h dmarc.c
+imap_utf7.o:	$(HDRS) imap_utf7.c
+spf.o:		$(HDRS) spf.h spf.c
+utf8.o:		$(HDRS) utf8.c
+
+# The module containing tables of available lookups, routers, auths, and
+# transports must be rebuilt if any of them are. However, because the makefiles
+# for the drivers are always run, we don't actually put the dependencies here,
+# because if we do, some version of "make" (e.g. IRIX) insist on rebuilding
+# drtables.o even though the .a files haven't in fact been updated. Instead
+# it is arranged that the lower-level makefiles remove drtables.o when they
+# rebuild the .a files.
+
+drtables.o:      $(HDRS) drtables.c
+
+# We depend upon object files built as part of building the lookups library
+# When using parallel make, we don't have the dependency to force building
+# in the sub-directory unless we force that dependency:
+
+$(OBJ_LOOKUPS):  buildlookups
+
+# The exim monitor's private modules - the sources live in a private
+# subdirectory. The final binary combines the private modules with some
+# modules from the main exim binary.
+
+em_StripChart.o: ../exim_monitor/em_StripChart.c
+em_TextPop.o:    ../exim_monitor/em_TextPop.c
+em_globals.o:    ../exim_monitor/em_globals.c ../exim_monitor/em_hdr.h
+em_init.o:       ../exim_monitor/em_init.c    ../exim_monitor/em_hdr.h
+em_log.o:        ../exim_monitor/em_log.c     ../exim_monitor/em_hdr.h
+em_main.o:       ../exim_monitor/em_main.c    ../exim_monitor/em_hdr.h
+em_menu.o:       ../exim_monitor/em_menu.c    ../exim_monitor/em_hdr.h
+em_queue.o:      ../exim_monitor/em_queue.c   ../exim_monitor/em_hdr.h
+em_strip.o:      ../exim_monitor/em_strip.c   ../exim_monitor/em_hdr.h
+em_text.o:       ../exim_monitor/em_text.c    ../exim_monitor/em_hdr.h
+em_xs.o:         ../exim_monitor/em_xs.c      ../exim_monitor/em_hdr.h
+em_version.o:    ../exim_monitor/em_version.c ../exim_monitor/em_hdr.h
+$(MONBIN): $(HDRS)
+		 @echo "$(CC) exim_monitor/$(@:.o=.c)"
+		 $(FE)$(CC) -o $@ -c $(CFLAGS) -DCOMPILE_UTILITY -I. -I../exim_monitor $(INCLUDE) $(XINCLUDE) \
+		   ../exim_monitor/$(@:.o=.c)
+
+
+# Targets for the various libraries that Exim uses.
+
+# The lookups library.
+
+buildlookups: config
+	 @cd lookups && $(MAKE) SHELL=$(SHELL) AR="$(AR)" $(MFLAGS) CC="$(CC)" CFLAGS="$(CFLAGS)" \
+	   CFLAGS_DYNAMIC="$(CFLAGS_DYNAMIC)" HDRS="../version.h $(PHDRS)" \
+	   FE="$(FE)" RANLIB="$(RANLIB)" RM_COMMAND="$(RM_COMMAND)" \
+	   INCLUDE="$(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE) $(LOOKUP_INCLUDE)"
+	 @echo " "
+
+# The routers library.
+
+buildrouters: config
+	 @cd routers && $(MAKE) SHELL=$(SHELL) AR="$(AR)" $(MFLAGS) CC="$(CC)" CFLAGS="$(CFLAGS)" \
+	   FE="$(FE)" RANLIB="$(RANLIB)" RM_COMMAND="$(RM_COMMAND)" HDRS="$(PHDRS)" \
+	   INCLUDE="$(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE)"
+	 @echo " "
+
+# The transports library.
+
+buildtransports: config
+	 @cd transports && $(MAKE) SHELL=$(SHELL) AR="$(AR)" $(MFLAGS) CC="$(CC)" CFLAGS="$(CFLAGS)" \
+	   FE="$(FE)" RANLIB="$(RANLIB)" RM_COMMAND="$(RM_COMMAND)" HDRS="$(PHDRS)" \
+	   INCLUDE="$(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE)"
+	 @echo " "
+
+# The library of authorization modules
+
+buildauths: config
+	 @cd auths && $(MAKE) SHELL=$(SHELL) AR="$(AR)" $(MFLAGS) CC="$(CC)" CFLAGS="$(CFLAGS)" \
+	   FE="$(FE)" RANLIB="$(RANLIB)" RM_COMMAND="$(RM_COMMAND)" HDRS="$(PHDRS)" \
+	   INCLUDE="$(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE)"
+	 @echo " "
+
+# The PDKIM library
+
+buildpdkim: pdkim/pdkim.a
+pdkim/pdkim.a: config
+	 @cd pdkim && $(MAKE) SHELL=$(SHELL) AR="$(AR)" $(MFLAGS) CC="$(CC)" CFLAGS="$(CFLAGS)" \
+	   FE="$(FE)" RANLIB="$(RANLIB)" RM_COMMAND="$(RM_COMMAND)" HDRS="$(PHDRS)" \
+	   INCLUDE="$(INCLUDE) $(IPV6_INCLUDE) $(TLS_INCLUDE)"
+	 @echo " "
+
+# The "clean", "install", and "makefile" targets just pass themselves back to
+# the main Exim makefile. These targets will be obeyed only if "make" is obeyed
+# for them in the build directory.
+
+clean install makefile:; cd ..; $(MAKE) $(MFLAGS) build=$(build) $@
+
+# Targets for building stand-alone testing programs for basic testing of
+# some of the building blocks. These are not integrated with the makefile-
+# building targets. If you change something that is going to cause the
+# makefile to be rebuilt, you must run "make makefile" before running one
+# of these.
+
+# The testing programs use different versions of some modules - usually
+# with bits cut out that are not relevant to the test in hand. For those
+# that are used by several tests, we use a different name.
+
+sa-globals.o:    $(HDRS) globals.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE -o sa-globals.o globals.c
+
+sa-os.o:         $(HDRS) os.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) \
+				      -DFIND_RUNNING_INTERFACES \
+				      -o sa-os.o os.c
+
+# These are the test targets themselves
+
+test_dbfn:   config.h dbfn.c dummies.o sa-globals.o sa-os.o store.o \
+	       string.o tod.o version.o utf8.o
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE dbfn.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DCOMPILE_UTILITY store.c
+	$(LNCC) -o test_dbfn $(LFLAGS) dbfn.o \
+	  dummies.o sa-globals.o sa-os.o store.o string.o \
+	  tod.o version.o utf8.o $(LIBS) $(DBMLIB) $(LDFLAGS)
+	rm -f dbfn.o store.o
+
+test_host:   config.h child.c host.c dns.c dummies.c sa-globals.o os.o \
+	       store.o string.o tod.o tree.o
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE -DTEST_HOST child.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE -DTEST_HOST host.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE -DTEST_HOST dns.c
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE -DTEST_HOST dummies.c
+	$(LNCC) -o test_host $(LFLAGS) \
+	  host.o child.o dns.o dummies.o sa-globals.o os.o store.o string.o \
+	  tod.o tree.o $(LIBS) $(LIBRESOLV)
+	rm -f child.o dummies.o host.o dns.o
+
+test_os:     os.h os.c dummies.o sa-globals.o store.o string.o tod.o utf8.o
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE os.c
+	$(LNCC) -o test_os $(LFLAGS) os.o dummies.o \
+	  sa-globals.o store.o string.o tod.o utf8.o $(LIBS) $(LDFLAGS)
+	rm -f os.o
+
+test_parse:  config.h parse.c dummies.o sa-globals.o \
+	     store.o string.o tod.o version.o utf8.o
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE parse.c
+	$(LNCC) -o test_parse $(LFLAGS) parse.o \
+	  dummies.o sa-globals.o store.o string.o tod.o version.o \
+	  utf8.o $(LDFLAGS)
+	rm -f parse.o
+
+test_string: config.h string.c dummies.o sa-globals.o store.o tod.o utf8.o
+	$(CC) -c $(CFLAGS) $(INCLUDE) -DSTAND_ALONE string.c
+	$(LNCC) -o test_string $(LFLAGS) -DSTAND_ALONE string.o \
+	  dummies.o sa-globals.o store.o tod.o utf8.o $(LIBS) $(LDFLAGS)
+	rm -f string.o
+
+# End
diff --git a/OS/Makefile-Default b/OS/Makefile-Default
new file mode 100644
index 0000000..6e42db4
--- /dev/null
+++ b/OS/Makefile-Default
@@ -0,0 +1,327 @@
+##################################################
+#          The Exim mail transport agent         #
+##################################################
+
+# Generic default make file containing settings that relate to the OS or
+# to selectable features within the OS. The configuration options for Exim
+# itself live in Local/Makefile, which is constructed by editing src/EDITME.
+
+# These settings are basic defaults which may be overridden, either by the
+# generic OS-specific files, or by site-specific files. Do not edit this file.
+# Instead, edit or create suitable OS-specific and/or site specific files.
+# See the manual for details.
+
+
+# MAKE_SHELL contains the name of the shell to be used for executing commands
+# from the make files. Normally /bin/sh should be used.
+
+MAKE_SHELL=/bin/sh
+
+
+# BASENAME_COMMAND contains the path to the "basename" command, which varies
+# from OS to OS. This is used when building the Exim monitor script only. (See
+# also HOSTNAME_COMMAND.) If BASENAME_COMMAND is set to "look_for_it" then the
+# script checks for /usr/bin/basename and /bin/basename, and if neither is
+# found, it uses /usr/ucb/basename. This copes with Solaris 2 and Linux, both
+# of which come in different versions.
+
+BASENAME_COMMAND=/usr/bin/basename
+
+
+# If you set STRIP_COMMAND to the path of the "strip" command, it will be run
+# on every binary that is built. It is left unset by default, which leaves
+# the binaries unstripped.
+
+# STRIP_COMMAND=/usr/bin/strip
+
+
+# Some of the following commands live in different places in different OS. We
+# include them all here for generality.
+
+CHOWN_COMMAND=/usr/bin/chown
+CHGRP_COMMAND=/usr/bin/chgrp
+CHMOD_COMMAND=/usr/bin/chmod
+MV_COMMAND=/bin/mv
+RM_COMMAND=/bin/rm
+TOUCH_COMMAND=/usr/bin/touch
+
+
+# Some operating systems have different ways of building libraries of
+# functions. This macro defines the command to do this, defaulting to
+# the "ar" command with options "cq".
+
+AR=ar cq
+
+
+# Not all operating systems have the iconv() function. Those that do have
+#
+# HAVE_ICONV=yes
+#
+# in their OS-specific Makefiles. On those that don't it is possible to
+# install an independent implementation of iconv(). If you've done this,
+# add "HAVE_ICONV=yes" to your Local/Makefile.
+
+
+# Perl is not necessary for running Exim itself, except when EXIM_PERL
+# is set to cause Perl embedding. However, some Perl utilities are provided
+# for processing the logs. Perl 5 is assumed.
+
+PERL_COMMAND=/usr/bin/perl
+
+
+# CC contains the name of the C compiler to be used.
+
+CC=gcc
+
+
+# CFLAGS contains flags to be passed to the compiler. Nothing is defaulted
+# here; instead each OS-dependent Makefile contains a default setting.
+
+# CFLAGS=-O
+
+
+# LFLAGS contains flags to be passed to the link editor. Nothing is defaulted
+# here; instead each OS-dependent Makefile contains a default setting if one
+# is needed.
+
+# LFLAGS=
+
+
+# PCRE_LIBS contains the library to be linked for PCRE
+
+PCRE_LIBS=-lpcre2-8
+
+
+# LIBS and EXTRALIBS contain library settings that are used on linking
+# commands to build binaries. The OS-dependent Makefile may contain a default
+# setting for LIBS, leaving EXTRALIBS available for adding further libraries
+# that are required for optional extras.
+
+# LIBS=
+# EXTRALIBS=
+
+
+# LIBS_EXIM and EXTRALIBS_EXIM contain library settings that are used
+# only when linking the Exim binary. They are not used for other binaries.
+# One possible use is for the TCP wrappers library.
+
+# LIBS_EXIM=
+# EXTRALIBS_EXIM=
+
+
+# LIBS_EXIMON and EXTRALIBS_EXIMON contain library settings that are
+# used only when linking the Exim monitor binary. They are not used for
+# other binaries.
+
+# LIBS_EXIMON=
+# EXTRALIBS_EXIMON=
+
+
+# The error name for quota exceeded varies among operating systems, and
+# even, unfortunately, in different versions of the same operating system.
+# EDQUOT was not in Sys V, but is in SPEC 1170, apparently. It was used
+# in SunOS4, but got taken out for SunOS5, where ENOSPC was given if a quota
+# was exceeded. However, it got put back into SunOS5 with a patch to 5.4 in
+# order to comply with SPEC 1170. Thus even different patch levels of the same
+# system (SunOS5) may use different numbers.
+#
+# If you don't have quotas or are not interested in handling quota errors
+# specially, just set this variable to 0. If it is not set, it defaults to
+# EDQUOT if that is defined for the OS; otherwise it defaults to ENOSPC.
+
+# ERRNO_QUOTA=EDQUOT
+
+
+# The exiwhat utility script finds all the processes running Exim, and sends
+# them a SIGUSR1 signal to get them to write their status to a file. There are
+# two ways in which this can be done:
+#
+# (1) If the OS has a command to find processes and signal them, that can be
+# used. Linux has "killall"; Solaris has "pkill". (Note: "killall" on Solaris
+# does something very different - and disastrous.) The following are set in the
+# OS-specific Makefiles for those OS where this can be done:
+
+# EXIWHAT_MULTIKILL_CMD=
+# EXIWHAT_MULTIKILL_ARG=
+
+# (2) For other operating systems, exiwhat calls the ps command and egreps the
+# output in order to find all the processes running Exim. The arguments for the
+# various commands needed to do this vary from OS to OS. These defaults work on
+# Solaris 2, HPUX, and IRIX. The OS-specific Makefiles have different versions
+# for other systems, and you can override with your own requirements in your
+# private Makefiles in the Local directory. The most commonly found
+# alternatives are -ax instead of -e for the ps argument, and / instead of a
+# blank before the name exim for the egrep argument on systems whose ps output
+# shows the full path name. The quotes for the egrep argument are specified
+# here so that leading white space can be used. This value should always be
+# given in single quotes.
+
+EXIWHAT_PS_CMD=/bin/ps
+EXIWHAT_PS_ARG=-e
+EXIWHAT_EGREP_ARG=' exim( |$$|-)'
+
+# For both kinds of exiwhat usage, the next setting specifies the signal that
+# is sent.
+
+EXIWHAT_KILL_SIGNAL=-USR1
+
+
+# IPv6 is gradually spreading more and more widely. Most operating systems seem
+# to support it nowadays. If you set this option, IPv6 support will be included
+# in the Exim binary. As well as the basic enabling option, there are
+# parameters for include and library directories that may be needed for IPv6 on
+# some systems, where the support is not yet in the standard library.
+
+# HAVE_IPV6=YES
+# IPV6_INCLUDE=-I /usr/ipv6/include
+# IPV6_LIBS=-L/usr/ipv6/libs -linet6
+
+# Exim uses the function getaddrinfo() for converting IPv6 addresses in text
+# form to binary. Apparently some operating systems do not support this, or not
+# correctly, and require the use of the function inet_pton() instead. The
+# following setting enables this. Note, however, the inet_pton() has reduced
+# functionality compared with getaddrinfo(). In particular, it does not
+# recognize the percent convention for identifying scopes (interfaces) that is
+# used by some operating systems.
+
+# IPV6_USE_INET_PTON=yes
+
+# HOSTNAME_COMMAND contains the path to the "hostname" command, which varies
+# from OS to OS. This is used when building the Exim monitor script only. (See
+# also BASENAME_COMMAND.) If HOSTNAME_COMMAND is set to "look_for_it" then the
+# script checks for /usr/bin/hostname and /bin/hostname, and if neither is
+# found, it uses /usr/ucb/basename. This copes with Solaris 2, which comes in
+# different versions.
+
+HOSTNAME_COMMAND=/bin/hostname
+
+
+# INCLUDE contains arbitrary include parameters that you may need to use
+# when building exim. It is added to every compile command.
+
+# INCLUDE=-I /some/special/include-directory
+
+
+# Some OS require a separate library to be quoted when linking programs that
+# call name resolver functions. This can be set in LIBRESOLV, which is left
+# unset here, but is set is some of the OS-specific Makefiles.
+
+# LIBRESOLV=
+
+
+# Additional libraries and include directories may be required for some
+# lookup styles, e.g. LDAP or SQL. LOOKUP_LIBS is included only on the
+# command for linking Exim itself, not on any auxiliary programs. You
+# don't need to set LOOKUP_INCLUDE if the relevant directories are already
+# specified in INCLUDE.
+
+# LOOKUP_INCLUDE=-I /usr/local/ldap/include -I /usr/local/sql/include
+# LOOKUP_LIBS=-L/usr/local/lib -lldap -llber
+
+
+# RANLIB should be set to something that does nothing on systems that do not
+# have the ranlib command or do not need to run it on library files.
+
+RANLIB=ranlib
+
+
+# EXIM_CHMOD is available to specify a command that is automatically applied
+# to the Exim binary immediately it is compiled. (I find this useful when
+# building test versions.)
+
+EXIM_CHMOD=@true
+
+
+# If you want to use local_scan() at all, the support code must be included
+# by uncommenting this line.
+
+# HAVE_LOCAL_SCAN=yes
+
+# LOCAL_SCAN_SOURCE defines the file in which the function local_scan() is
+# defined. This provides the administrator with a hook for including C code
+# for scanning incoming mails. The path that is defined must be relative to
+# the Exim distribution directory. For example
+
+# LOCAL_SCAN_SOURCE=Local/local_scan.c
+
+# A very simple example points to a template function that doesn't actually do
+# any scanning, but just accepts the message.  A compilable file must be
+# included in the build even if HAVE_LOCAL_SCAN is not defined.
+
+LOCAL_SCAN_SOURCE=src/local_scan.c
+
+# If you want to specify options for your local_scan() that can be set from
+# the main Exim configuration file, you need to uncomment the following line,
+# and then provide a table of options in your local_scan() source, as described
+# in the reference manual.
+
+# LOCAL_SCAN_HAS_OPTIONS=yes
+
+
+#############################################################################
+# The following are all concerned with configuring the way Exim handles its
+# database (hints) and other dbm files.
+
+# Some systems require a separate library to be supplied when linking programs
+# that make use of DBM library calls. This can be set in DBMLIB, which is unset
+# by default, but is set in some of the OS-specific Makefiles. Setting it in
+# your Local/Makefile will override any other setting.
+
+# DBMLIB=
+
+
+# When Exim is attempting to lock one of its database (hints) files, it
+# applies a timeout which can be altered here.
+
+# EXIMDB_LOCK_TIMEOUT=60
+
+
+# By default, Exim uses traditional ndbm function calls to handle its indexed
+# hints databases. On systems that have Berkeley db installed, this still
+# works via the compatibility interface. However, by defining USE_DB you can
+# make it use native db function calls.
+
+# USE_DB=YES
+
+# Similarly, if you are using gdbm, Exim will by default use the ndbm
+# compatibility interface. However, by defining USE_GDBM you can make it
+# use the native gdbm function calls.
+
+# USE_GDBM=YES
+
+
+#############################################################################
+# The following definitions are relevant only when compiling the Exim monitor
+# program, which requires an X11 display. See the variable EXIM_MONITOR in
+# src/EDITME for how to suppress this compilation.
+
+# X11 contains the location of the X11 libraries and include files.
+
+X11=/usr/X11R6
+
+# XINCLUDE contains options for header inclusion when compiling functions
+# that call X11 functions.
+
+XINCLUDE=-I$(X11)/include
+
+# XLFLAGS contains flags to be passed to the linker when linking the monitor.
+
+XLFLAGS=-L$(X11)/lib
+
+# X11_LD_LIB contains the name of the X11 library that is to be added to
+# LD_LIBRARY_PATH when running the monitor program.
+
+X11_LD_LIB=$(X11)/lib
+
+# A modified version of the Athena TextPop module is supplied with Exim. The
+# modification is to remove the "replace" part of the "search and replace"
+# operation because it isn't wanted. TextPop is only one of a number of
+# modules that make up the Text widget. Some antique link editors cannot handle
+# the case of a replacement module for one of a set of modules. To allow
+# the monitor to be linked in such cases, set the value of EXIMON_TEXTPOP
+# to be empty. The search operations will then contain a useless "replace"
+# option, which is untidy, but does no harm.
+
+EXIMON_TEXTPOP=em_TextPop.o
+
+# End
diff --git a/OS/Makefile-FreeBSD b/OS/Makefile-FreeBSD
new file mode 100644
index 0000000..02253d9
--- /dev/null
+++ b/OS/Makefile-FreeBSD
@@ -0,0 +1,54 @@
+# Exim: OS-specific make file for FreeBSD
+# Copyright (c) The Exim Maintainers 2020
+
+CHOWN_COMMAND=/usr/sbin/chown
+#STRIP_COMMAND=/usr/bin/strip
+CHMOD_COMMAND=/bin/chmod
+
+
+# FreeBSD Ports no longer insert compatibility symlinks into /usr/bin for
+# scripting languages which traditionally have had them.
+PERL_COMMAND=/usr/local/bin/perl
+
+HAVE_SA_LEN=YES
+
+# crypt() is in a separate library
+LIBS=-lcrypt -lm -lutil
+
+# Dynamically loaded modules need to be built with -fPIC
+CFLAGS_DYNAMIC=-shared -rdynamic -fPIC
+
+# FreeBSD always ships with Berkeley DB
+USE_DB=yes
+
+# This code for building outside ports suggested by Richard Clayton
+.ifdef   X11BASE
+X11=${X11BASE}
+.elifdef LOCALBASE
+X11=$(LOCALBASE)
+.else
+X11=/usr/local
+.endif
+
+# nb: FreeBSD is entirely elf; objformat was removed prior to FreeBSD 7
+# http://www.freebsd.org/cgi/cvsweb.cgi/src/usr.bin/objformat/Attic/objformat.c
+# deleted Jan 2007.
+#
+# So if this fails, you're on an ancient unsupported FreeBSD release *and*
+# running GUI software, which seems both unusual and unwise.
+#
+# http://www.freebsd.org/doc/handbook/binary-formats.html suggests that the
+# switch to default to ELF came with FreeBSD 3.  elf(5) claims ELF support
+# introduced in FreeBSD 2.2.6.
+#
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib -Wl,-rpath,${X11}/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD='killall -m'
+EXIWHAT_MULTIKILL_ARG='^exim($$|-[0-9.]+-[0-9]+$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/Makefile-GNU b/OS/Makefile-GNU
new file mode 100644
index 0000000..b49976f
--- /dev/null
+++ b/OS/Makefile-GNU
@@ -0,0 +1,30 @@
+# Exim: OS-specific make file for GNU and variants.
+# Copyright (c) The Exim Maintainers 2020
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=look_for_it
+CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
+
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+
+DBMLIB = -ldb
+USE_DB = yes
+
+LIBS = -lnsl -lcrypt -lm
+LIBRESOLV = -lresolv
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD=killall
+EXIWHAT_MULTIKILL_ARG=exim
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/Makefile-Linux b/OS/Makefile-Linux
new file mode 100644
index 0000000..dfb2fa8
--- /dev/null
+++ b/OS/Makefile-Linux
@@ -0,0 +1,39 @@
+# Exim: OS-specific make file for Linux. This is for modern Linuxes,
+# which use libc6.
+# Copyright (c) The Exim Maintainers 2020
+#
+# For Linux, we assume GNU Make; at time of writing, the only extension
+# used is ?= which is actually portable to other maintained Make variants,
+# just is not POSIX.
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=look_for_it
+CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
+
+# The system cc may be gcc or clang; do not force gcc
+CC=cc
+# Preserve CFLAGS and CFLAGS_DYNAMIC from the caller/environment
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+CFLAGS_DYNAMIC ?= -shared -rdynamic
+
+DBMLIB = -ldb
+USE_DB = yes
+
+LIBS = -lcrypt -lm
+LIBRESOLV = -lresolv
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD=killall
+EXIWHAT_MULTIKILL_ARG=exim
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/Makefile-OpenBSD b/OS/Makefile-OpenBSD
new file mode 100644
index 0000000..6976326
--- /dev/null
+++ b/OS/Makefile-OpenBSD
@@ -0,0 +1,30 @@
+# Exim: OS-specific make file for OpenBSD
+# Copyright (c) The Exim Maintainers 2022
+
+CHOWN_COMMAND=/usr/sbin/chown
+CHGRP_COMMAND=/usr/sbin/chgrp
+CHMOD_COMMAND=/bin/chmod
+
+CC=cc
+CFLAGS=-O2 -Wall -Wno-parentheses -Wno-self-assign -Wno-logical-op-parentheses
+
+LIBS=-lm
+
+HAVE_SA_LEN=YES
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+
+EXIWHAT_MULTIKILL_CMD=pkill
+EXIWHAT_MULTIKILL_ARG='exim( |$$|-)'
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+HAVE_IPV6=YES
+
+# OpenBSD ships with a too-old Berkeley DB.  NDBM is the default if we don't specify one.
+#USE_DB=yes
+
+# End
diff --git a/OS/Makefile-SunOS5 b/OS/Makefile-SunOS5
new file mode 100644
index 0000000..3b436f4
--- /dev/null
+++ b/OS/Makefile-SunOS5
@@ -0,0 +1,24 @@
+# Exim: OS-specific make file for SunOS5
+# Copyright (c) The Exim Maintainers 2020
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+HOSTNAME_COMMAND=look_for_it
+
+RANLIB=@true
+LIBS=-lsocket -lnsl -lkstat -lm
+LIBRESOLV=-lresolv
+
+EXIWHAT_MULTIKILL_CMD=pkill
+EXIWHAT_MULTIKILL_ARG='exim( |$$|-)'
+
+X11=/usr/openwin
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib -R$(X11)/lib
+X11LIB=$(X11)/lib
+
+OS_C_INCLUDES=setenv.c
+CFLAGS += -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED=1 -D__EXTENSIONS__
+
+# End
diff --git a/OS/eximon.conf-Default b/OS/eximon.conf-Default
new file mode 100644
index 0000000..2f874ef
--- /dev/null
+++ b/OS/eximon.conf-Default
@@ -0,0 +1,41 @@
+# Exim: Default settings for the eximon script which fires up the Exim monitor.
+# These can be overridden by OS-specific scripts and local installation
+# scripts, and also at run time by shell variables.
+
+# The name of the eximon binary, usually the same as the eximon script,
+# with .bin stuck on the end.
+
+EXIMON_BINARY="${EXIMON_BINARY-$0.bin}"
+
+# The remaining parameters are values likely to be changed to suit the
+# user's taste. They are documented in the EDITME file.
+
+WINDOW_TITLE=${EXIMON_WINDOW_TITLE-'"${hostname} eximon"'}
+
+ACTION_OUTPUT=${EXIMON_ACTION_OUTPUT-no}
+ACTION_QUEUE_UPDATE=${EXIMON_ACTION_QUEUE_UPDATE-yes}
+BODY_MAX=${EXIMON_BODY_MAX-20000}
+LOG_DEPTH=${EXIMON_LOG_DEPTH-300}
+LOG_WIDTH=${EXIMON_LOG_WIDTH-${EXIMON_WIDTH-950}}
+LOG_BUFFER=${EXIMON_LOG_BUFFER-20K}
+LOG_FONT=${EXIMON_LOG_FONT--misc-fixed-medium-r-normal-*-14-140-*-*-*-*-iso8859-1}
+LOG_STRIPCHARTS='/ <= /in/
+                 / => /out/
+                 / => .+ R=local/local/
+                 / => .+ T=[^ ]*smtp/smtp/'
+MENU_EVENT=${EXIMON_MENU_EVENT-'Shift<Btn1Down>'}
+MIN_HEIGHT=${EXIMON_MIN_HEIGHT-162}
+MIN_WIDTH=${EXIMON_MIN_WIDTH-103}
+QUEUE_DEPTH=${EXIMON_QUEUE_DEPTH-200}
+QUEUE_WIDTH=${EXIMON_QUEUE_WIDTH-${EXIMON_WIDTH-950}}
+QUEUE_FONT=${EXIMON_QUEUE_FONT-${LOG_FONT}}
+QUEUE_MAX_ADDRESSES=${EXIMON_QUEUE_MAX_ADDRESSES-10}
+QUEUE_INTERVAL=${EXIMON_QUEUE_INTERVAL-300}
+QUEUE_STRIPCHART_NAME=${EXIMON_QUEUE_STRIPCHART_NAME-queue}
+SIZE_STRIPCHART=${EXIMON_SIZE_STRIPCHART}
+SIZE_STRIPCHART_NAME=${EXIMON_SIZE_STRIPCHART_NAME}
+START_SMALL=${EXIMON_START_SMALL-no}
+STRIPCHART_INTERVAL=${EXIMON_STRIPCHART_INTERVAL-60}
+TEXT_DEPTH=${EXIMON_TEXT_DEPTH-200}
+
+# End
diff --git a/OS/os.Configuring b/OS/os.Configuring
new file mode 100644
index 0000000..465bc26
--- /dev/null
+++ b/OS/os.Configuring
@@ -0,0 +1,215 @@
+Configuring Exim for different Operating Systems
+------------------------------------------------
+
+These notes describe the way in which Exim is configured at the C program level
+for different operating systems. The normal configuration options that apply
+independently of the operating system are specified by creating files in the
+Local directory, as described in chapter 4 of the manual.
+
+These notes cover the os.* files in the OS directory, and contain information
+for people who want to port the program to some new OS, or to modify the
+configuration for an existing port. If you are just wanting to compile Exim on
+a system that it already knows about, you do not need to read further unless
+there are problems.
+
+The os.c-<ostype> files
+-----------------------
+
+There may be an os.c-<ostype> file for each operating system, but for many of
+them it is not necessary. No error occurs is there isn't one. There is a
+generic file called os.c which contains code that is common to two or more OS
+for setting a restarting or a non-restarting signal, for computing the load
+average, and for finding all the network interface addresses. A few OS have
+their own individual code for one or more of these. When they do, the code is
+put into an os.c-<ostype> file, which also defines a macro such as
+OS_RESTARTING_SIGNAL (for example) to cut out the common code in the generic
+os.c.
+
+The os.h-<ostype> files
+-----------------------
+
+For each OS that Exim knows about, there is an os.h-<ostype> file, where
+<ostype> is the OS name. The relevant file is included as a C header file for
+all Exim compilation by pointing a symbolic link called os.h at it from the
+build directory. The settings are as follows:
+
+The select() function
+---------------------
+
+There is a difference in the data type for the second argument to the select()
+function in some OS. The macro SELECT_ARG2_TYPE can be used to define the type.
+If it is not defined in os.h, then it is defaulted to fs_set in exim.h.
+
+The dn_expand() function
+------------------------
+
+There is a difference in the data type for the fourth argument to the
+dn_expand() function in some OS. The macro DN_EXPAND_ARG4_TYPE can be used to
+define the type. If it is not defined in os.h, then it is defaulted to char *
+in exim.h.
+
+The h_errno variable
+--------------------
+
+If NEED_H_ERRNO is defined, then a definition of the form
+
+extern int h_errno
+
+is included in the compiled code of Exim.
+
+The strerror() function
+-----------------------
+
+Most systems provide the ANSI standard strerror() function; older systems may
+instead have an errlist[] variable in which to look up error texts. Defining
+STRERROR_FROM_ERRLIST causes Exim to build its own strerror() function that
+mimics the ANSI function by lookup up the error code in errlist.
+
+Truncating files
+----------------
+
+The fcntl() option for truncating the length of a file is called F_FREESP in
+most systems; in some, however, it is called O_TRUNC. Some os.h files define
+F_FREESP to be O_TRUNC for this reason.
+
+Finding local interfaces
+------------------------
+
+The SIOCGIFCONF ioctl for finding local interfaces behaves differently on BSD
+systems. It returns a vector of ifreq blocks containing sockaddr structures
+that can be longer than their sizeof definition, making the returned ifreq
+blocks longer than their sizeof definitions. BSD sockaddrs structures contain
+an sa_len field giving the actual size. To cope with difference, there is a
+macro called HAVE_SA_LEN. If it is defined, code that works on BSD systems is
+used. Otherwise, the objects returned by SIOCGIFCONF are assumed to be of
+length sizeof(struct ifreq).
+
+On some operating systems, the SIOCGIFCONF ioctl returns the IP addresses
+with the list of interfaces, and there is no need to call SIOCGIFADDR for each
+individual address. Mostly, making the second call does no harm, but on Linux
+when there are IP aliases, it causes things to go wrong. This also happens on
+BSDI and GNU Hurd. Therefore, there is now a macro to cut it out, called
+SIOCGIFCONF_GIVES_ADDR.
+
+Note that, if IPv6 support is configured, Exim cannot find the IPv6 addresses
+on local interfaces by itself. You need to set the local_interfaces option in
+this situation.
+
+Computing load averages
+-----------------------
+
+There are several different ways that load averages are computed. One-off code
+is put in the os.c-<ostype>, but several OS use similar methods, and these
+are coded in the generic os.c, using a number of parameters to make variations
+between OS.
+
+Sometimes the load average is not available to unprivileged callers. If
+LOAD_AVG_NEEDS_ROOT is set, Exim ensures that it is root before trying to
+obtain a load average value.
+
+(1) If HAVE_BSD_GETLOADAVG is defined, Exim uses a simple call to the
+getloadavg() function.
+
+(2) If HAVE_KSTAT is defined, Exim uses the kstat package as found in Solaris 2
+(but nowhere else as yet). It uses some supplementary definitions:
+
+  LOAD_AVG_KSTAT          the kstat to use
+  LOAD_AVG_KSTAT_MODULE   the module to access
+  LOAD_AVG_KSTAT_SYMBOL   the symbol containing the value we want
+  LOAD_AVG_KSTAT_FIELD    the field identity
+
+(3) If HAVE_DEV_KMEM is defined, Exim reads load average values from the
+/dev/kmem device. It uses some supplementary definitions:
+
+  LOAD_AVG_TYPE           the data type
+  LOAD_AVG_SYMBOL         the symbol to look up
+  KERNEL_PATH             the name of the kernel
+  FSCALE                  a scaling factor
+
+Sometimes FSCALE is defined in system headers so need not be defined in the
+os.h-<ostype> file.
+
+Glibc systems and IP options
+----------------------------
+
+The code for inspecting IP options is the same in all OS except for systems
+using glibc (e.g. Linux), which uses a different structure to return data from
+getsockopt(). To handle this, there is a macro called
+
+  GLIBC_IP_OPTIONS
+
+which should be set for Linux (in os.h-Linux) and any other operating system
+that uses glibc.
+
+Options for statvfs()
+---------------------
+
+The following settings apply to the compilation of the Exim monitor as well as
+to the main Exim binary.
+
+#undefine HAVE_STATFS
+
+Exim has options for checking the amount of space in the spool partition
+before accepting a message, and the monitor has the ability to display a
+stripchart of the percentage fullness of a particular disc partition, usually
+/var/spool/mail. The standard way of finding out the data is to call the
+statvfs() function, but some operating systems use statfs() and some may not
+have the ability at all. The Exim code uses STATVFS() for this function and
+this gets defined appropriately. HAVE_STATFS is defined before including the
+os.h file; undefining it suppresses the code for checking a partition in the
+main binary, and for monitoring disc partition in the monitor.
+
+When HAVE_STATFS is defined, the distinction between statvfs() and statfs() is
+made by checking HAVE_SYS_STATVFS_H. If it is defined, then sys/statvfs.h is
+included. Otherwise, STATVFS() is defined as a macro for statfs(), and some
+further includes are done, according to the following definitions:
+
+#define HAVE_SYS_MOUNT_H
+#define HAVE_VFS_H
+
+Each of those definitions causes the inclusion of the corresponding system
+header file in the Exim monitor compilation. For example, the first one causes
+
+#include <sys/mount.h>
+
+to be obeyed. Different systems may require different combinations of these
+headers.
+
+The sys/resource.h header
+-------------------------
+
+One OS does not have the sys/resource.h header. If NO_SYS_RESOURCE_H is defined
+in an os.h-<ostype> file, then the #include for this header is skipped in
+exim.h.
+
+Support for login_cap functions
+-------------------------------
+
+Some of the BSD systems support functions for controlling the resources that
+user processes can use (e.g. login_getpwclass). If HAVE_SETCLASSRESOURCES is
+defined, Exim supports this feature for running pipe deliveries, using the
+setclassresources() function.
+
+The crypt_h header
+------------------
+
+Some OS require crypt.h to be included to get a prototype for the crypt()
+function. This is needed only when compiling with AUTH support. If CRYPT_H is
+defined, then this header is included.
+
+mmap() support
+--------------
+
+The CDB support includes the option of handling file operations by using
+mmap()/munmap(). This gives a reasonable performance increase which will
+probably scale over multiple processes (since the files are mapped read-only
+shared). The vast majority of modern operating systems will support mmap
+(certainly in the simplified way that it is being used here). For example any
+BSD 4.x derived or POSIX compliant system will support it, as will pretty much
+any system using dynamically shared link libraries.
+
+If the OS is believed to support mmap() then the symbol HAVE_MMAP is defined.
+Not all systems that support mmap will have had their config files updated to
+reflect this. Currently Linux, Sun, BSD and SGI/mips systems have been updated.
+
+*** End ***
diff --git a/OS/os.c-FreeBSD b/OS/os.c-FreeBSD
new file mode 100644
index 0000000..02b7858
--- /dev/null
+++ b/OS/os.c-FreeBSD
@@ -0,0 +1,49 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) Jeremy Harris 1995 - 2020 */
+/* Copyright (c) The Exim Maintainers 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* FreeBSD-specific code. This is concatenated onto the generic
+src/os.c file. */
+
+
+/*************
+Sendfile shim
+*************/
+
+ssize_t
+os_sendfile(int out, int in, off_t * offp, size_t cnt)
+{
+off_t loff = offp ? *offp : 0;
+off_t written;
+
+if (sendfile(in, out, loff, cnt, NULL, &written, 0) < 0) return (ssize_t)-1;
+if (offp) *offp = loff + written;
+return (ssize_t)written;
+}
+
+/*************************************************
+TCP Fast Open:  check that the ioctl is accepted
+*************************************************/
+
+#ifndef COMPILE_UTILITY
+void
+tfo_probe(void)
+{
+# ifdef TCP_FASTOPEN
+int sock;
+
+if (  (sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0
+   && setsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN, &on, sizeof(on) >= 0)
+   )
+  f.tcp_fastopen_ok = TRUE;
+close(sock);
+# endif
+}
+#endif
+
+
+/* End of os.c-Linux */
diff --git a/OS/os.c-GNU b/OS/os.c-GNU
new file mode 100644
index 0000000..dbd0149
--- /dev/null
+++ b/OS/os.c-GNU
@@ -0,0 +1,56 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2020 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* GNU-specific code. This is concatenated onto the generic src/os.c file.
+GNU/Hurd has approximately the same way to determine the load average as NeXT,
+so a variant of this could also be in the generic os.c file. See the GNU EMacs
+getloadavg.c file, from which this snippet was derived. getloadavg.c from Emacs
+is copyrighted by the FSF under the terms of the GPLv2 or any later version.
+Changes are hereby placed under the same license, as requested by the GPL. */
+
+#ifndef OS_LOAD_AVERAGE
+#define OS_LOAD_AVERAGE
+
+#include <mach.h>
+
+static processor_set_t default_set;
+static int getloadavg_initialized;
+
+int
+os_getloadavg (void)
+{
+host_t host;
+struct processor_set_basic_info info;
+unsigned info_count;
+
+if (!getloadavg_initialized)
+  {
+  if (processor_set_default (mach_host_self(), &default_set) == KERN_SUCCESS)
+    getloadavg_initialized = 1;
+  }
+
+if (getloadavg_initialized)
+  {
+  info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
+  if (processor_set_info(default_set, PROCESSOR_SET_BASIC_INFO, &host,
+       (processor_set_info_t)&info, &info_count) != KERN_SUCCESS)
+    getloadavg_initialized = 0;
+  else
+    {
+    #if LOAD_SCALE == 1000
+    return info.load_average;
+    #else
+    return (int) (((double) info.load_average * 1000) / LOAD_SCALE));
+    #endif
+    }
+  }
+
+return -1;
+}
+#endif  /* OS_LOAD_AVERAGE */
+
+/* End of os.c-GNU */
diff --git a/OS/os.c-Linux b/OS/os.c-Linux
new file mode 100644
index 0000000..59d81f8
--- /dev/null
+++ b/OS/os.c-Linux
@@ -0,0 +1,165 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1997 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Linux-specific code. This is concatenated onto the generic
+src/os.c file. */
+
+
+/*************************************************
+*              Load average computation          *
+*************************************************/
+
+/*Linux has an apparently unique way of getting the load average, so we provide
+a unique function here, and define OS_LOAD_AVERAGE to stop src/os.c trying to
+provide the function. However, when compiling os.c for utilities, we may not
+want this at all, so check that it isn't set first. */
+
+#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
+#define OS_LOAD_AVERAGE
+
+/* Linux has 2 ways of returning load average:
+
+  (1) Do a read on /proc/loadavg
+  (2) Use the sysinfo library function and syscall
+
+The latter is simpler but in Linux 2.0 - 2.2 (and probably later releases) is
+exceptionally slow - 10-50ms per call is not unusual and about 100x slow the
+first method. This cripples high performance mail servers by increasing CPU
+utilisation by 3-5x.
+
+In Exim's very early days, it used the 1st method. Later, it switched to the
+2nd method. Now it tries the 1st method and falls back to the 2nd if /proc is
+unavailable. */
+
+#include <sys/sysinfo.h>
+
+static int
+linux_slow_getloadavg(void)
+{
+struct sysinfo s;
+double avg;
+if (sysinfo(&s) < 0) return -1;
+avg = (double) (s.loads[0]) / (1<<SI_LOAD_SHIFT);
+return (int)(avg * 1000.0);
+}
+
+int
+os_getloadavg(void)
+{
+char buffer[40];
+double avg;
+int count;
+int fd = open ("/proc/loadavg", O_RDONLY);
+if (fd == -1) return linux_slow_getloadavg();
+count = read (fd, buffer, sizeof(buffer));
+(void)close (fd);
+if (count <= 0) return linux_slow_getloadavg();
+count = sscanf (buffer, "%lf", &avg);
+if (count < 1) return linux_slow_getloadavg();
+return (int)(avg * 1000.0);
+}
+#endif  /* OS_LOAD_AVERAGE */
+
+
+
+
+
+/*************************************************
+*         Finding interface addresses            *
+*************************************************/
+
+/* This function is not required for utilities; we cut it out if
+FIND_RUNNING_INTERFACES is already defined. */
+
+#ifndef FIND_RUNNING_INTERFACES
+
+/* This code, contributed by Jason Gunthorpe, appears to be the current
+way of finding IPv6 interfaces in Linux. It first calls the common function in
+order to find IPv4 interfaces, then grobbles around to find the others. Jason
+said, "This is so horrible, don't look. Slightly ripped from net-tools
+ifconfig." It gets called by virtue of os_find_running_interfaces being defined
+as a macro for os_find_running_interfaces_linux in the os.h-Linux file. */
+
+ip_address_item *
+os_find_running_interfaces_linux(void)
+{
+ip_address_item *yield = NULL;
+
+#if HAVE_IPV6
+ip_address_item *last = NULL;
+ip_address_item  *next;
+char addr6p[8][5];
+unsigned int plen, scope, dad_status, if_idx;
+char devname[20+1];
+FILE *f;
+#endif
+
+yield = os_common_find_running_interfaces();
+
+#if HAVE_IPV6
+
+/* Open the /proc file; give up if we can't. */
+
+if ((f = fopen("/proc/net/if_inet6", "r")) == NULL) return yield;
+
+/* Pick out the data from within the file, and add it on to the chain */
+
+last = yield;
+if (last != NULL) while (last->next != NULL) last = last->next;
+
+while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
+             addr6p[0], addr6p[1], addr6p[2], addr6p[3],
+             addr6p[4], addr6p[5], addr6p[6], addr6p[7],
+             &if_idx, &plen, &scope, &dad_status, devname) != EOF)
+  {
+  struct sockaddr_in6 addr;
+
+  /* This data has to survive for ever, so use malloc. */
+
+  next = store_malloc(sizeof(ip_address_item));
+  next->next = NULL;
+  next->port = 0;
+  sprintf(CS next->address, "%s:%s:%s:%s:%s:%s:%s:%s",
+         addr6p[0], addr6p[1], addr6p[2], addr6p[3],
+         addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
+
+  /* Normalize the representation */
+
+  inet_pton(AF_INET6, CS next->address, &addr.sin6_addr);
+  inet_ntop(AF_INET6, &addr.sin6_addr, CS next->address, sizeof(next->address));
+
+  if (yield == NULL) yield = last = next; else
+    {
+    last->next = next;
+    last = next;
+    }
+
+  DEBUG(D_interface)
+    debug_printf("Actual local interface address is %s (%s)\n", last->address,
+      devname);
+  }
+fclose(f);
+#endif  /* HAVE_IPV6 */
+
+return yield;
+}
+
+#endif  /* FIND_RUNNING_INTERFACES */
+
+
+/*************
+* Sendfile   *
+*************/
+#include <sys/sendfile.h>
+
+ssize_t
+os_sendfile(int out, int in, off_t * off, size_t cnt)
+{
+return sendfile(out, in, off, cnt);
+}
+
+/* End of os.c-Linux */
diff --git a/OS/os.c-SunOS5 b/OS/os.c-SunOS5
new file mode 100644
index 0000000..1624869
--- /dev/null
+++ b/OS/os.c-SunOS5
@@ -0,0 +1,16 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 2016 */
+/* Copyright (c) Jeremy Harris 2016 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Solaris-specific code. This is concatenated onto the generic
+src/os.c file. */
+
+#if defined(MISSING_UNSETENV_3) && !defined(COMPILE_UTILITY)
+# include "setenv.c"
+#endif
+
+/* End of os.c-SunOS5 */
diff --git a/OS/os.h-FreeBSD b/OS/os.h-FreeBSD
new file mode 100644
index 0000000..06e217a
--- /dev/null
+++ b/OS/os.h-FreeBSD
@@ -0,0 +1,81 @@
+/* Exim: OS-specific C header file for FreeBSD */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 - 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_SETCLASSRESOURCES
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define HAVE_GETIFADDRS
+#define SIOCGIFCONF_GIVES_ADDR
+#define HAVE_SRANDOMDEV
+#define HAVE_ARC4RANDOM
+#define EXIM_HAVE_OPENAT
+#define EXIM_HAVE_FUTIMENS
+
+/* Applications should not call arc4random_stir() explicitly after
+ * FreeBSD r227520 (approximately 1000002).
+ * Set NOT_HAVE_ARC4RANDOM_STIR if the version released is past
+ * that point. */
+#if __FreeBSD_version >= 1000002
+# define NOT_HAVE_ARC4RANDOM_STIR
+#endif
+
+typedef struct flock flock_t;
+
+/* iconv arg2 type: libiconv in Ports uses "const char* * inbuf" and was
+ * traditionally the only approach available.  The iconv functionality
+ * in libc is "char ** restrict src".
+ *
+ * <https://www.freebsd.org/doc/en/books/porters-handbook/using-iconv.html>
+ * says that libc has iconv since 2013, in 10-CURRENT.  FreeBSD man-pages
+ * shows it included in 10.0-RELEASE.  Writing this in 2017, 10.3 is the
+ * oldest supported release, so we should assume non-libiconv by default.
+ * (Actually, people still using old releases past EOL; we shouldn't support
+ * them but I don't want to deal with howls of complaints because we dare
+ * to not support the unsupported, so guard this on FreeBSD 10+)
+ *
+ * Thus we no longer override iconv.
+ *
+ * However, if libiconv is installed, and anything adds /usr/local/include
+ * to include-path (likely) then we'll get that.  So define a variable
+ * which makes the libiconv try to not interfere with OS iconv.
+ */
+#if __FreeBSD__ >= 10
+# define LIBICONV_PLUG
+#endif
+/* for more specific version constraints, look at __FreeBSD_version
+ * from <sys/param.h> */
+
+/* When using DKIM, setting OS_SENDFILE can increase
+performance on outgoing mail a bit. */
+
+#define OS_SENDFILE
+extern ssize_t os_sendfile(int, int, off_t *, size_t);
+
+#ifdef PID_T_FMT
+# undef PID_T_FMT
+#endif
+#define PID_T_FMT "%d"
+
+
+/*******************/
+
+#define EXIM_TFO_PROBE
+#define EXIM_TFO_FREEBSD
+
+
+/* for TCP state-variable values, for TFO logging */
+#include <netinet/tcp_fsm.h>
+#define TCP_SYN_RECV TCPS_SYN_RECEIVED
+
+/*******************/
+
+#define EXIM_HAVE_KEVENT
+
+/* End */
diff --git a/OS/os.h-GNU b/OS/os.h-GNU
new file mode 100644
index 0000000..4b22260
--- /dev/null
+++ b/OS/os.h-GNU
@@ -0,0 +1,34 @@
+/* Exim: OS-specific C header file for GNU/Hurd */
+/* Copyright (c) The Exim Maintainers 2020 - 2021 */
+
+#include <features.h>
+
+#define CRYPT_H
+#define GLIBC_IP_OPTIONS
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_MMAP
+#define HAVE_SYS_VFS_H
+#define NO_IP_VAR_H
+#define SIG_IGN_WORKS
+#define SIOCGIFCONF_GIVES_ADDR
+
+#define F_FREESP     O_TRUNC
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+/* Hurd-specific bits below */
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* setgroups(0, NULL) succeeds, and drops the gid group
+as well as any supplementary groups*/
+#define OS_SETGROUPS_ZERO_DROPS_ALL
+
+#if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOURCE
+# define EXIM_HAVE_OPENAT
+#endif
+
+/* End */
diff --git a/OS/os.h-Linux b/OS/os.h-Linux
new file mode 100644
index 0000000..e6a8d28
--- /dev/null
+++ b/OS/os.h-Linux
@@ -0,0 +1,104 @@
+/* Exim: OS-specific C header file for Linux */
+/* Copyright (c) University of Cambridge 1995 - 2020 */
+/* Copyright (c) The Exim Maintainers 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+/* Some old systems we've received bug-reports for have a <limits.h> which
+does not pull in <features.h>.  Best to just pull it in now and have done
+with the issue. */
+
+#include <features.h>
+#include <sys/types.h>
+
+
+#define CRYPT_H
+#define GLIBC_IP_OPTIONS
+#define HAVE_MMAP
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_SYS_STATVFS_H
+#define HAVE_GETIFADDRS
+#define NO_IP_VAR_H
+#define SIG_IGN_WORKS
+
+/* When using DKIM, setting OS_SENDFILE can increase
+performance on outgoing mail a bit. Note: With older glibc versions
+this setting will conflict with the _FILE_OFFSET_BITS=64 setting
+defined as part of the Linux CFLAGS.  As of 2017 those are declared
+to be too old to build by default. */
+
+#define OS_SENDFILE
+extern ssize_t os_sendfile(int, int, off_t *, size_t);
+
+#define F_FREESP     O_TRUNC
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+#if defined(__linux__) || defined(__FreeBSD_kernel__) || defined(__NetBSD_kernel__)
+# define SIOCGIFCONF_GIVES_ADDR
+# define HAVE_SYS_MOUNT_H
+#endif
+
+#if defined(__linux__)
+
+/* Some versions of Linux need explicit sync-ing of directories as well as
+files. This setting requests that. If the directory is on NFS, it may not
+be possible to sync it - in that case, Exim now should ignore the error. But
+if you have problems in that area, try undefining this. But be aware that you
+may be in a situation where files are not being properly "committed to stable
+storage" as quickly as Exim thinks they are. */
+
+#define NEED_SYNC_DIRECTORY
+
+#define os_find_running_interfaces os_find_running_interfaces_linux
+
+/* Need a prototype for the Linux-specific function. The structure hasn't
+been defined yet, so we need to pre-declare it. */
+
+struct ip_address_item;
+extern struct ip_address_item *os_find_running_interfaces_linux(void);
+
+#endif /* __linux__ */
+
+/* Some folks running "unusual" setups with very old libc environments have
+found that _GNU_SOURCE=1 before <features.h> is not sufficient to define some
+constants needed for 64-bit arithmetic.  If you encounter build errors based
+on LLONG_MIN being undefined and various other escape hatches have not helped,
+then change the 0 to 1 in the next block. */
+
+#if 0
+# define LLONG_MIN LONG_LONG_MIN
+# define LLONG_MAX LONG_LONG_MAX
+#endif
+
+#if _POSIX_C_SOURCE >= 200809L || _ATFILE_SOURCE
+# define EXIM_HAVE_OPENAT
+# define EXIM_HAVE_FUTIMENS
+#endif
+
+/* TCP Fast Open support */
+
+#include <netinet/tcp.h>	/* for TCP_FASTOPEN */
+#include <sys/socket.h>		/* for MSG_FASTOPEN */
+#if defined(TCP_FASTOPEN) && !defined(MSG_FASTOPEN)
+# define MSG_FASTOPEN 0x20000000
+#endif
+#define EXIM_HAVE_TCPI_UNACKED
+#ifndef TCPI_OPT_SYN_DATA
+# define TCPI_OPT_SYN_DATA 32
+#endif
+
+/* "Abstract" Unix-socket names */
+#define EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
+
+/* inotify(7) etc syscalls */
+#define EXIM_HAVE_INOTIFY
+
+/* Needed for uClibc */
+#ifndef NS_MAXMSG
+# define NS_MAXMSG 65535
+#endif
+
+/* End */
diff --git a/OS/os.h-OpenBSD b/OS/os.h-OpenBSD
new file mode 100644
index 0000000..c690b6e
--- /dev/null
+++ b/OS/os.h-OpenBSD
@@ -0,0 +1,65 @@
+/* Exim: OS-specific C header file for OpenBSD */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define HAVE_GETIFADDRS
+#define EXIM_HAVE_OPENAT
+#define EXIM_HAVE_FUTIMENS
+#define HAVE_ARC4RANDOM
+/* In May 2014, OpenBSD 5.5 was released which cleaned up the arc4random_* API
+   which removed the arc4random_stir() function. Set NOT_HAVE_ARC4RANDOM_STIR
+   if the version released is past that point. */
+#include <sys/param.h>
+#if OpenBSD >= 201405
+# define NOT_HAVE_ARC4RANDOM_STIR
+#endif
+
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+typedef struct __res_state *res_state;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+#ifndef EPROTO
+# define EPROTO 71
+#endif
+
+/* We need to force this; the automatic in buildconfig.c gets %ld */
+#ifdef OFF_T_FMT
+# undef OFF_T_FMT
+# undef LONGLONG_T
+#endif
+#define OFF_T_FMT "%lld"
+#define LONGLONG_T long long int
+
+#ifdef PID_T_FMT
+# undef PID_T_FMT
+#endif
+#define PID_T_FMT "%d"
+
+#ifdef INO_T_FMT
+# undef INO_T_FMT
+#endif
+#define INO_T_FMT "%llu"
+
+#ifdef TIME_T_FMT
+# undef TIME_T_FMT
+#endif
+#define TIME_T_FMT "%lld"
+
+/* seems arpa/nameser.h does not define this.
+Space-constrained devices could use much smaller; a few k. */
+#define NS_MAXMSG 65535
+
+#define EXIM_HAVE_KEVENT
+
+/* End */
diff --git a/OS/os.h-SunOS5 b/OS/os.h-SunOS5
new file mode 100644
index 0000000..7125321
--- /dev/null
+++ b/OS/os.h-SunOS5
@@ -0,0 +1,58 @@
+/* Exim: OS-specific C header file for SunOS5 aka Solaris */
+/* Copyright (c) The Exim Maintainers 2021 */
+
+#define CRYPT_H
+#define HAVE_MMAP
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL                f_favail
+#define SIOCGIFCONF_GIVES_ADDR
+
+#define HAVE_GETIPNODEBYNAME    1
+#define HAVE_GETIPNODEBYADDR    1
+#define EXIM_HAVE_OPENAT
+#define EXIM_HAVE_FUTIMENS
+
+#define HAVE_KSTAT
+#define LOAD_AVG_KSTAT         "system_misc"
+#define LOAD_AVG_KSTAT_MODULE  "unix"
+#define LOAD_AVG_SYMBOL        "avenrun_1min"
+#define LOAD_AVG_FIELD          value.ui32
+
+#define os_strsignal            strsignal
+#define OS_STRSIGNAL
+
+/* This is needed for some early Solaris releases, but causes trouble
+in the current ones, so it is out by default. */
+
+/* #define EXIM_SOCKLEN_T       size_t */
+
+/* This is different from Linux and all other PAM implementations,
+it seems. */
+
+#define PAM_CONVERSE_ARG2_TYPE  struct pam_message
+
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+#if _POSIX_C_SOURCE < 200112L
+# define MISSING_UNSETENV_3
+#endif
+
+#if _POSIX_C_SOURCE < 200809L
+# define MISSING_POSIX_MEMALIGN
+#endif
+
+
+/* SunOS5 doesn't accept getcwd(NULL, 0) to auto-allocate
+a buffer */
+
+#define OS_GETCWD
+
+
+#ifndef MIN
+# define MIN(a,b) (((a)<(b))?(a):(b))
+# define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+/* End */
diff --git a/OS/unsupported/Makefile-AIX b/OS/unsupported/Makefile-AIX
new file mode 100644
index 0000000..fc32aa2
--- /dev/null
+++ b/OS/unsupported/Makefile-AIX
@@ -0,0 +1,28 @@
+# Exim: OS-specific make file for AIX
+# Written by Nick Waterman (nick@cimio.co.uk)
+# Modified by PH following a message from Mike Meredith
+
+# Note that the output of uname -m is probably not what Philip expected,
+# so you might end up with more build-AIX-random_number directories than
+# you expected if you have too many AIX boxes, but it seems to work... I
+# blame IBM.
+
+# Note that nowadays you have to pay extra for a cc compiler with AIX!
+
+CC=gcc
+
+# This needs to be in here rather than os.h-AIX because of regexp stuff.
+# basically strchr is a #define, which means "extern char *strchr()"
+# ruins things. __STR31__ seems to get around this by magic. The AIX
+# include files are quite a confusing maze.
+# Mike M says this is not necessary any more; possibly this is related to
+# using gcc. Commented out by PH.
+#CFLAGS = -D__STR31__
+
+CFLAGS = -mcpu=power4 -maix64 -O3
+
+# Needed for vfork() and vfork() only?
+
+LIBS = -lbsd -lm
+
+# End
diff --git a/OS/unsupported/Makefile-BSDI b/OS/unsupported/Makefile-BSDI
new file mode 100644
index 0000000..d56aa9b
--- /dev/null
+++ b/OS/unsupported/Makefile-BSDI
@@ -0,0 +1,21 @@
+# Exim: OS-specific make file for BSDI aka BSD/OS. Its antique link editor
+# cannot handle the TextPop overriding.
+
+CFLAGS=-O
+CHOWN_COMMAND=/usr/sbin/chown
+
+HAVE_SA_LEN=YES
+
+X11=/usr/X11
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+LIBS_EXIMON=-lSM -lICE -lipc -lm
+EXIMON_TEXTPOP=
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-CYGWIN b/OS/unsupported/Makefile-CYGWIN
new file mode 100644
index 0000000..5e608fe
--- /dev/null
+++ b/OS/unsupported/Makefile-CYGWIN
@@ -0,0 +1,113 @@
+# OS-specific file for Cygwin.
+
+# This file provided by Pierre A. Humblet <Pierre.Humblet@ieee.org>
+
+HAVE_IPV6 = yes
+HAVE_ICONV = yes
+# Use c99 to have %z 
+CFLAGS= -g -Wall -std=c99 -U __STRICT_ANSI__
+LIBS= -lcrypt -lresolv
+LIBS_EXIM= -liconv
+EXIWHAT_PS_ARG=-as
+EXIWHAT_KILL_SIGNAL=-USR1
+EXIWHAT_EGREP_ARG='/(EXIM|exim)[0-9. -]*$$'
+
+DBMLIB=-lgdbm
+USE_GDBM=YES
+
+# Some OS add a suffix to executables
+EXE = .exe
+
+# To add a resource file with an icon
+LIBS_EXIM +=../Local/exim_res.o
+
+# To produce a linker map
+#LIBS_EXIM+=-Wl,-Map,Exim.Map
+
+
+##################################################
+# The following is normally set in local/Makefile.
+# Makefile.cygwin provides defaults with which the
+# precompiled version is built
+##################################################
+
+BIN_DIRECTORY=/usr/bin
+CONFIGURE_FILE=/etc/exim.conf
+EXIM_USER=18   # This changes if user exim exists
+EXIM_GROUP=544 # Administrators
+SPOOL_DIRECTORY=/var/spool/exim
+LOG_FILE_PATH=/var/log/exim/exim_%s.log
+TIMEZONE_DEFAULT = ""
+
+AUTH_CRAM_MD5=yes
+AUTH_PLAINTEXT=yes
+AUTH_SPA=yes
+
+#DISABLE_TLS=yes
+TLS_LIBS=-lssl -lcrypto
+
+ROUTER_ACCEPT=yes
+ROUTER_DNSLOOKUP=yes
+ROUTER_IPLITERAL=yes
+ROUTER_MANUALROUTE=yes
+ROUTER_QUERYPROGRAM=yes
+ROUTER_REDIRECT=yes
+
+TRANSPORT_APPENDFILE=yes
+TRANSPORT_AUTOREPLY=yes
+TRANSPORT_PIPE=yes
+TRANSPORT_SMTP=yes
+
+SUPPORT_MAILDIR=yes
+SUPPORT_MAILSTORE=yes
+SUPPORT_MBX=yes
+
+LOOKUP_DBM=yes
+LOOKUP_LSEARCH=yes
+
+# LOOKUP_CDB=yes
+LOOKUP_DNSDB=yes
+LOOKUP_DSEARCH=yes
+LOOKUP_LDAP=yes
+# LOOKUP_MYSQL=yes
+# LOOKUP_NIS=yes
+# LOOKUP_NISPLUS=yes
+# LOOKUP_ORACLE=yes
+LOOKUP_PASSWD=yes
+# LOOKUP_PGSQL=yes
+# LOOKUP_WHOSON=yes
+
+LDAP_LIB_TYPE=OPENLDAP2
+LOOKUP_LIBS=-lldap -llber
+
+WITH_CONTENT_SCAN=yes
+
+# It is important to define these variables but the values are always overridden
+CONFIGURE_OWNER=18
+CONFIGURE_GROUP=544
+
+EXICYCLOG_MAX=10
+
+COMPRESS_COMMAND=/usr/bin/gzip
+COMPRESS_SUFFIX=gz
+ZCAT_COMMAND=/usr/bin/zcat
+
+# EXIM_PERL=perl.o
+
+# Comment the two lines below if you do not have PAM, e.g. from
+# ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/porters/Humblet_Pierre_A
+SUPPORT_PAM=yes
+CFLAGS += -DINCLUDE_PAM -I ../pam -I ../../pam
+
+# All modes are in octal and must start with 0
+EXIMDB_DIRECTORY_MODE    = 01777
+EXIMDB_MODE              = 0666
+EXIMDB_LOCKFILE_MODE     = 0666
+INPUT_DIRECTORY_MODE  = 01777
+LOG_DIRECTORY_MODE    = 01777
+LOG_MODE              = 0666
+MSGLOG_DIRECTORY_MODE = 01777
+SPOOL_DIRECTORY_MODE  = 01777
+SPOOL_MODE            = 0600
+
+# End
diff --git a/OS/unsupported/Makefile-DGUX b/OS/unsupported/Makefile-DGUX
new file mode 100644
index 0000000..667c63f
--- /dev/null
+++ b/OS/unsupported/Makefile-DGUX
@@ -0,0 +1,32 @@
+# Exim: OS-specific make file for DGUX
+#
+# Written by Ken Bailey (K.Bailey@rbgkew.org.uk) Feb 1998
+# on dgux R4.11MU04 generic AViiON mc88100
+# with no X
+
+# Minor tidies to remove settings that are actually the default,
+# in line with the style of other system files - PH.
+
+BASENAME_COMMAND=/bin/basename
+CHOWN_COMMAND=/bin/chown
+CHGRP_COMMAND=/bin/chgrp
+CHMOD_COMMAND=/bin/chmod
+
+# PERL
+# Perl is not necessary for running Exim itself, but some Perl utilities
+# are provided for processing the logs. Perl 5 is assumed.
+# DG ship perl version 4.036 in /bin/perl so need to use locally installed perl
+
+PERL_COMMAND=/usr/local/bin/perl
+
+# dg's version of gcc likes O2
+
+CFLAGS=-O2
+
+RANLIB=@true
+LIBS=-lsocket -lnsl -lm
+LIBRESOLV=-lresolv
+DBMLIB=-ldbm
+
+# End
+
diff --git a/OS/unsupported/Makefile-Darwin b/OS/unsupported/Makefile-Darwin
new file mode 100644
index 0000000..517bbc4
--- /dev/null
+++ b/OS/unsupported/Makefile-Darwin
@@ -0,0 +1,33 @@
+# Exim: OS-specific make file for Darwin (Mac OS X).
+
+CC=cc
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=/usr/sbin/chown
+CHMOD_COMMAND=/bin/chmod
+
+HAVE_SA_LEN=YES
+
+# Removed -DBIND_8_COMPAT for 4.61
+# CFLAGS=-O -no-cpp-precomp -DBIND_8_COMPAT
+#
+# 2020/05/12 disable TLS resume support; it results in
+# "1 select() failure: No such file or directory"
+# being logged by the daeomn (sending the testsuite red...)
+
+CFLAGS=-O -no-cpp-precomp -DDISABLE_TLS_RESUME
+LIBRESOLV=-lresolv
+
+USE_DB = yes
+DBMLIB =
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-DragonFly b/OS/unsupported/Makefile-DragonFly
new file mode 100644
index 0000000..c49c59f
--- /dev/null
+++ b/OS/unsupported/Makefile-DragonFly
@@ -0,0 +1,31 @@
+# Exim: OS-specific make file for DragonFly
+# There's no setting of CFLAGS here, to allow the system default
+# for "make" to be the default.
+
+CHOWN_COMMAND=/usr/sbin/chown
+CHMOD_COMMAND=/bin/chmod
+
+HAVE_SA_LEN=YES
+
+# crypt() is in a separate library
+LIBS=-lcrypt -lm
+
+# DragonFly always ships with Berkeley DB
+USE_DB=yes
+
+# X11 may be under /usr/pkg/xorg/ for example.
+# X11=/usr/X11R6
+X11=$(X11BASE)
+
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+XLFLAGS+=-Wl,-rpath,${X11BASE}/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD='killall -m'
+EXIWHAT_MULTIKILL_ARG='^exim($$|-[0-9.]+-[0-9]+$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-GNUkFreeBSD b/OS/unsupported/Makefile-GNUkFreeBSD
new file mode 100644
index 0000000..8019281
--- /dev/null
+++ b/OS/unsupported/Makefile-GNUkFreeBSD
@@ -0,0 +1,29 @@
+# Exim: OS-specific make file for GNU and variants.
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=look_for_it
+CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
+
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+
+DBMLIB = -ldb
+USE_DB = yes
+
+LIBS = -lnsl -lcrypt -lm
+LIBRESOLV = -lresolv
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD=killall
+EXIWHAT_MULTIKILL_ARG=exim4
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-GNUkNetBSD b/OS/unsupported/Makefile-GNUkNetBSD
new file mode 100644
index 0000000..8019281
--- /dev/null
+++ b/OS/unsupported/Makefile-GNUkNetBSD
@@ -0,0 +1,29 @@
+# Exim: OS-specific make file for GNU and variants.
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=look_for_it
+CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
+
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+
+DBMLIB = -ldb
+USE_DB = yes
+
+LIBS = -lnsl -lcrypt -lm
+LIBRESOLV = -lresolv
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD=killall
+EXIWHAT_MULTIKILL_ARG=exim4
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-HI-OSF b/OS/unsupported/Makefile-HI-OSF
new file mode 100644
index 0000000..da3d487
--- /dev/null
+++ b/OS/unsupported/Makefile-HI-OSF
@@ -0,0 +1,8 @@
+# Exim: OS-specific make file for HI-OSF/1-MJ and HI-UX/MPP
+
+CC=cc
+CFLAGS=-O
+RANLIB=@true
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+
+# End
diff --git a/OS/unsupported/Makefile-HI-UX b/OS/unsupported/Makefile-HI-UX
new file mode 100644
index 0000000..870ee84
--- /dev/null
+++ b/OS/unsupported/Makefile-HI-UX
@@ -0,0 +1,12 @@
+# Exim: OS-specific make file for HI-UX
+
+CC=cc -Aa -D_HIUX_SOURCE
+HAVE_SETRESUID=YES
+HAVE_SETEUID=NO
+XINCLUDE=-I/usr/include/X11R5
+XLFLAGS=-L/usr/lib/X11R5
+DBMLIB = -lndbm
+NEED_H_ERRNO=1
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-HP-UX b/OS/unsupported/Makefile-HP-UX
new file mode 100644
index 0000000..ea35144
--- /dev/null
+++ b/OS/unsupported/Makefile-HP-UX
@@ -0,0 +1,27 @@
+# Exim: OS-specific make file for HP-UX later than 9
+
+# HP ANSI C compiler
+#CC=cc
+#CFLAGS=+O2 +Onolimit -z -D_XOPEN_SOURCE_EXTENDED
+# Users of the A.06.00 compiler might need to use +O1 rather than +O2 as
+# there have been some problems reported with this compiler with +O2 set.
+
+# gcc
+CFLAGS=-O -D_XOPEN_SOURCE_EXTENDED
+LDFLAGS=-Wl,-z
+LIBS=-lm
+
+BASENAME_COMMAND=/bin/basename
+HAVE_ICONV=yes
+HAVE_SETRESUID=YES
+HAVE_SETEUID=NO
+XINCLUDE=-I/usr/include/X11R6 -I/usr/contrib/X11R6/include
+XLFLAGS=-L/usr/lib/X11R6 -L/usr/contrib/X11R6/lib
+X11_LD_LIB=/usr/contrib/X11R6/lib
+EXIMON_TEXTPOP=
+DBMLIB=-lndbm
+RANLIB=@true
+
+OS_C_INCLUDES=setenv.c
+
+# End
diff --git a/OS/unsupported/Makefile-HP-UX-9 b/OS/unsupported/Makefile-HP-UX-9
new file mode 100644
index 0000000..1530009
--- /dev/null
+++ b/OS/unsupported/Makefile-HP-UX-9
@@ -0,0 +1,15 @@
+# Exim: OS-specific make file for HP-UX 9
+
+CFLAGS=-O
+BASENAME_COMMAND=/bin/basename
+HAVE_ICONV=yes
+HAVE_SETRESUID=YES
+HAVE_SETEUID=NO
+XINCLUDE=-I/usr/include/X11R5
+XLFLAGS=-L/usr/lib/X11R5 -L/usr/contrib/X11R5/lib
+X11_LD_LIB=/usr/contrib/X11R5/lib
+EXIMON_TEXTPOP=
+DBMLIB=-lndbm
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-IRIX b/OS/unsupported/Makefile-IRIX
new file mode 100644
index 0000000..7b95783
--- /dev/null
+++ b/OS/unsupported/Makefile-IRIX
@@ -0,0 +1,12 @@
+# Exim: OS-specific make file for IRIX
+
+HAVE_ICONV=yes
+BASENAME_COMMAND=/sbin/basename
+HOSTNAME_COMMAND=/usr/bsd/hostname
+CFLAGS=-OPT:Olimit=1500
+LIBS=-lmld -lm
+XINCLUDE=-I/usr/include/X11
+vfork=fork
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-IRIX6 b/OS/unsupported/Makefile-IRIX6
new file mode 100644
index 0000000..be01138
--- /dev/null
+++ b/OS/unsupported/Makefile-IRIX6
@@ -0,0 +1,13 @@
+# Exim: OS-specific make file for IRIX6 on 64-bit systems
+
+HAVE_ICONV=yes
+HOSTNAME_COMMAND=/usr/bsd/hostname
+CFLAGS=-O2 -n32 -OPT:Olimit=4000
+LFLAGS=-n32
+LIBS=-lelf -lm
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=
+vfork=fork
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-IRIX632 b/OS/unsupported/Makefile-IRIX632
new file mode 100644
index 0000000..b567fc6
--- /dev/null
+++ b/OS/unsupported/Makefile-IRIX632
@@ -0,0 +1,16 @@
+# Exim: OS-specific make file for IRIX 6 on 32-bit systems.
+# There seems to be some variation. The commented settings show
+# some alternatives.
+
+HAVE_ICONV=yes
+HOSTNAME_COMMAND=/usr/bsd/hostname
+#CFLAGS=-OPT:Olimit=1500 -32 -mips2
+CFLAGS=-32
+LFLAGS=-32
+#LIBS=-lmld
+LIBS=-lelf -lm
+XINCLUDE=-I/usr/include/X11
+vfork=fork
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-IRIX65 b/OS/unsupported/Makefile-IRIX65
new file mode 100644
index 0000000..50e7745
--- /dev/null
+++ b/OS/unsupported/Makefile-IRIX65
@@ -0,0 +1,16 @@
+# Exim: OS-specific make file for IRIX 6.5
+
+HAVE_ICONV=yes
+HOSTNAME_COMMAND=/usr/bsd/hostname
+CC=cc
+CFLAGS=-O2 -OPT:Olimit=0
+# CFLAGS=-O2 # override with this (in your Local/Makefile) if using gcc
+LFLAGS=-Wl,-LD_MSG:off=85
+LFLAGS=
+# nlist has moved from libmld to libelf
+LIBS=-lelf -lm
+XINCLUDE=-I/usr/include/X11
+vfork=fork
+RANLIB=@true
+
+# End
diff --git a/OS/unsupported/Makefile-NetBSD b/OS/unsupported/Makefile-NetBSD
new file mode 100644
index 0000000..35d03a2
--- /dev/null
+++ b/OS/unsupported/Makefile-NetBSD
@@ -0,0 +1,27 @@
+# Exim: OS-specific make file for NetBSD (ELF object format)
+
+CHOWN_COMMAND=/usr/sbin/chown
+CHMOD_COMMAND=/bin/chmod
+
+CFLAGS ?= -O2
+
+HAVE_SA_LEN=YES
+HAVE_IPV6=YES
+LIBS=-lcrypt -lm
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# NetBSD always ships with Berkeley DB
+USE_DB=yes
+
+# NetBSD ELF linker needs a -R flag.
+XLFLAGS+=-Wl,-R$(X11)/lib/
+
+# End
diff --git a/OS/unsupported/Makefile-NetBSD-a.out b/OS/unsupported/Makefile-NetBSD-a.out
new file mode 100644
index 0000000..e210efd
--- /dev/null
+++ b/OS/unsupported/Makefile-NetBSD-a.out
@@ -0,0 +1,24 @@
+# Exim: OS-specific make file for NetBSD (a.out/COFF object format)
+
+CHOWN_COMMAND=/usr/sbin/chown
+CHMOD_COMMAND=/bin/chmod
+
+CFLAGS ?= -O2
+
+HAVE_SA_LEN=YES
+HAVE_IPV6=YES
+LIBS=-lcrypt -lm
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# NetBSD always ships with Berkeley DB
+USE_DB=yes
+
+# End
diff --git a/OS/unsupported/Makefile-OSF1 b/OS/unsupported/Makefile-OSF1
new file mode 100644
index 0000000..811ca07
--- /dev/null
+++ b/OS/unsupported/Makefile-OSF1
@@ -0,0 +1,10 @@
+# Exim: OS-specific make file for OSF1
+
+CFLAGS=-O
+LIBS=-liconv -lm
+HAVE_CRYPT16=yes
+HAVE_ICONV=yes
+HOSTNAME_COMMAND=/usr/bin/hostname
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+
+# End
diff --git a/OS/unsupported/Makefile-OpenUNIX b/OS/unsupported/Makefile-OpenUNIX
new file mode 100644
index 0000000..e4d7261
--- /dev/null
+++ b/OS/unsupported/Makefile-OpenUNIX
@@ -0,0 +1,17 @@
+# Exim: OS-specific make file for OpenUNIX
+
+CC=/usr/bin/cc
+CFLAGS=-O -I/usr/local/include
+LFLAGS=-L/usr/local/lib
+
+LIBS=-lsocket -lnsl -lelf -lgen -lresolv -lm
+EXTRALIBS_EXIMON=-lICE -lSM
+
+RANLIB=@true
+ERRNO_QUOTA=0
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-QNX b/OS/unsupported/Makefile-QNX
new file mode 100644
index 0000000..3cf81c4
--- /dev/null
+++ b/OS/unsupported/Makefile-QNX
@@ -0,0 +1,30 @@
+# Exim: OS-specific makefile for QNX
+
+BASENAME_COMMAND=/bin/basename
+MAKE_SHELL=/usr/bin/bash
+
+CHOWN_COMMAND=/bin/chown
+CHGRP_COMMAND=/bin/chgrp
+CHMOD_COMMAND=/bin/chmod
+HOSTNAME_COMMAND=/bin/hostname
+MV_COMMAND=/bin/mv
+PERL_COMMAND=/usr/bin/perl
+RM_COMMAND=/bin/rm
+
+AR=ar -rc
+
+CC=cc
+CFLAGS=-Otax
+LIBIDENTCFLAGS=
+
+RANLIB=@true
+DBMLIB=-ldb
+USE_DB=yes
+LIBS=-lsocket -lm
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-SCO b/OS/unsupported/Makefile-SCO
new file mode 100644
index 0000000..baa61d8
--- /dev/null
+++ b/OS/unsupported/Makefile-SCO
@@ -0,0 +1,28 @@
+# Exim: OS-specific make file for SCO
+
+# It was reported that some versions of gcc (e.g. 2.8.1) require this to be
+# CFLAGS=-melf
+
+CFLAGS=-b elf
+
+RANLIB=@true
+DBMLIB=-lndbm
+ERRNO_QUOTA=0
+LIBS=-lsocket -lm
+HAVE_ICONV=yes
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+# Changes from Frank Bernhardt (30/09/04)
+
+BASENAME_COMMAND=/bin/basename
+CHOWN_COMMAND=/bin/chown
+CHGRP_COMMAND=/bin/chgrp
+CHMOD_COMMAND=/bin/chmod
+HOSTNAME_COMMAND=/usr/bin/hostname
+TOUCH_COMMAND=/bin/touch
+
+# End
diff --git a/OS/unsupported/Makefile-SCO_SV b/OS/unsupported/Makefile-SCO_SV
new file mode 100644
index 0000000..249b81a
--- /dev/null
+++ b/OS/unsupported/Makefile-SCO_SV
@@ -0,0 +1,34 @@
+# Exim: OS-specific make file for SCO_SV release 5 (tested on 5.0.5 & 5.0.5)
+#       (see the UNIX_SV files for SCO 4.2)
+# Supplied by: Tony Earnshaw <tonye@ilion.nl>
+
+# Note that 'gcc -melf -m486' applies to gcc 2.7.2 and higher;
+# 2.7.1 and SCO's SDK need '-belf'.
+
+# Removed -lwrap (PH 27/7/00) because not all systems have it
+
+CFLAGS=-melf -O3 -m486
+LFLAGS=-L/lib -L/usr/lib -L/usr/local/lib
+LIBS=-ltinfo -lsocket -lm
+
+HAVE_ICONV=yes
+
+RANLIB=@true
+DBMLIB=-lndbm
+ERRNO_QUOTA=0
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+# Changes from Frank Bernhardt (30/9/04)
+
+BASENAME_COMMAND=/bin/basename
+CHOWN_COMMAND=/bin/chown
+CHGRP_COMMAND=/bin/chgrp
+CHMOD_COMMAND=/bin/chmod
+HOSTNAME_COMMAND=/usr/bin/hostname
+TOUCH_COMMAND=/bin/touch
+
+# End
diff --git a/OS/unsupported/Makefile-SunOS4 b/OS/unsupported/Makefile-SunOS4
new file mode 100644
index 0000000..c876998
--- /dev/null
+++ b/OS/unsupported/Makefile-SunOS4
@@ -0,0 +1,16 @@
+# Exim: OS-specific make file for SunOS4
+
+CFLAGS=-O
+
+CHOWN_COMMAND=/usr/etc/chown
+HOSTNAME_COMMAND=/usr/bin/hostname
+EXIT_FAILURE=1
+EXIT_SUCCESS=0
+LIBRESOLV=-lresolv
+XINCLUDE=-I/usr/include/X11
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-30
+
+# End
diff --git a/OS/unsupported/Makefile-SunOS5-hal b/OS/unsupported/Makefile-SunOS5-hal
new file mode 100644
index 0000000..05ea893
--- /dev/null
+++ b/OS/unsupported/Makefile-SunOS5-hal
@@ -0,0 +1,18 @@
+# Exim: OS-specific make file for SunOS5 on a HAL
+
+# Note: The HAL runs a standard SunOS5 except that it has a 64 bit C
+# compiler called hcc.  To make things work pass the -KV7 flag to force
+# 32bit compilation - this is necessary to interwork with some libraries.
+
+CC=hcc
+CFLAGS=-O -KV7
+LIBIDENTCFLAGS="-KV7 -O -DHAVE_ANSIHEADERS"
+LIBIDENTNAME=sunos5
+RANLIB=@true
+LIBS=-lsocket -lnsl -lkstat -lm
+LIBRESOLV=-lresolv
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib -R$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-ULTRIX b/OS/unsupported/Makefile-ULTRIX
new file mode 100644
index 0000000..9e912b3
--- /dev/null
+++ b/OS/unsupported/Makefile-ULTRIX
@@ -0,0 +1,18 @@
+# Exim: OS-specific make file for Ultrix
+
+MAKE_SHELL=/usr/bin/sh5
+
+CFLAGS=-O
+
+# This can either be /usr/include/X11 or /usr/include/mit depending on
+# the particular version of ULTRIX.
+
+XINCLUDE=-I/usr/include/X11 -I/usr/include/mit
+
+DBMLIB=-lgdbm
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-UNIX_SV b/OS/unsupported/Makefile-UNIX_SV
new file mode 100644
index 0000000..bfcfae1
--- /dev/null
+++ b/OS/unsupported/Makefile-UNIX_SV
@@ -0,0 +1,24 @@
+# Exim: OS-specific make file for SCO SVR4.2MP (and maybe Unixware)
+#
+#  *** Note that for SCO 5 the configuration file is called SCO_SV,
+#  *** and that Unixware7 has its own configuration. This is an old
+#  *** file that is retained for compatibility.
+#
+# Note that SCO does not include dbm/ndbm with their standard compiler
+# (it is available with /usr/ucb/cc, but that has bugs of its own). You
+# should install gcc and gdbm, then execute 'make install-compat' in the
+# gdbm source directory.
+
+CC=gcc -I/usr/local/include
+CFLAGS=-O
+
+RANLIB=@true
+DBMLIB=-lgdbm -L/usr/local/lib
+ERRNO_QUOTA=0
+LIBS=-lsocket -lelf -lgen -lnsl -lresolv -lm
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-USG b/OS/unsupported/Makefile-USG
new file mode 100644
index 0000000..753a2d7
--- /dev/null
+++ b/OS/unsupported/Makefile-USG
@@ -0,0 +1,33 @@
+# Exim: OS-specific make file for Unixware 2.x
+#
+# Note that Unixware does not include db/dbm/ndbm with their standard compiler
+# (it is available with /usr/ucb/cc, but that has bugs of its own). You
+# should install gcc and Berkeley DB (or another dbm library if you really
+# insist). If you use a different dbm library you will need to override
+# DBMLIB below.
+#
+# DB 1.85 and 2.x can be found at http://www.sleepycat.com/.
+# They have different characteristics. See the discussion of dbm libraries
+# in doc/dbm.discuss.txt in the Exim distribution.
+#
+# DB needs to be compiled with gcc and you need a 'cc' in your path
+# before the Unixware CC to compile it.
+#
+# Don't bother even starting to install exim on Unixware unless
+# you have installed gcc and use it for everything.
+
+CC=gcc -I/usr/local/include
+CFLAGS=-O
+
+RANLIB=@true
+DBMLIB=-ldb -L/usr/local/lib
+USE_DB=YES
+ERRNO_QUOTA=0
+LIBS=-lsocket -lelf -lgen -lnsl -lresolv -lm
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-Unixware7 b/OS/unsupported/Makefile-Unixware7
new file mode 100644
index 0000000..88a8838
--- /dev/null
+++ b/OS/unsupported/Makefile-Unixware7
@@ -0,0 +1,32 @@
+# Exim: OS-specific make file for Unixware7
+# Based on information from James FitzGibbon <james@ehlo.com>
+
+# If you want to use libbind, you need to
+#     add -I/usr/local/bind/include to CFLAGS
+#     add -L/usr/local/bind/lib to LFLAGS
+#     remove -lresolv from LIBS
+#     add LOOKUP_LIBS=-lbind
+# The new settings should go in your Local/Makefile rather than here; then
+# they will be usable for subsequent Exim releases.
+
+CC=/usr/bin/cc
+CFLAGS=-O -I/usr/local/include
+LFLAGS=-L/usr/local/lib
+
+HAVE_ICONV=yes
+
+LIBS=-lsocket -lnsl -lelf -lgen -lresolv -lm
+
+# Removed on the advice of Larry Rosenman
+# EXTRALIBS=-lwrap
+
+EXTRALIBS_EXIMON=-lICE -lSM
+
+RANLIB=@true
+ERRNO_QUOTA=0
+
+X11=/usr/lib/X11
+XINCLUDE=-I/usr/include/X11
+XLFLAGS=-L/usr/lib -L$(X11)/lib
+
+# End
diff --git a/OS/unsupported/Makefile-mips b/OS/unsupported/Makefile-mips
new file mode 100644
index 0000000..ff33139
--- /dev/null
+++ b/OS/unsupported/Makefile-mips
@@ -0,0 +1,16 @@
+# Exim: OS-specific make file for RiscOS4bsd
+
+HOSTNAME_COMMAND=/usr/ucb/hostname
+EXIT_FAILURE=1
+EXIT_SUCCESS=0
+LIBRESOLV=-lresolv
+LIBS=-liberty -lm
+XINCLUDE=-I/usr/X11R6/include
+
+CFLAGS=-O
+
+EXIWHAT_PS_ARG=-ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_KILL_SIGNAL=-30
+
+# End
diff --git a/OS/unsupported/README b/OS/unsupported/README
new file mode 100644
index 0000000..73790ae
--- /dev/null
+++ b/OS/unsupported/README
@@ -0,0 +1,14 @@
+Files in this directory are historical.  They may have worked once but the
+project has no assurance that they still do.
+
+If you need to use one for a build for your platform, copy it up one directory
+level first.  We'll reinstate it given a current version and evidence of testing.
+For the latter please look into the project regression testsuite, and please
+consider operating a buildfarm animal in the long term (it runs the testsuite).
+
+The buildfarm status page is:
+  https://buildfarm.exim.org/cgi-bin/show_status.pl
+There's a "register" link there with a link to how-to instructions.  Please do
+monitor the status of your animal on an ongoing basis.  The exim-users or
+exim-dev mailinglist are good places to ask for help and to discuss any regressions
+seen in test runs.  There is also the #exim IRC channel on Freenode.
diff --git a/OS/unsupported/os.c-BSDI b/OS/unsupported/os.c-BSDI
new file mode 100644
index 0000000..03a7a1c
--- /dev/null
+++ b/OS/unsupported/os.c-BSDI
@@ -0,0 +1,19 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) 2016 Heiko Schlittermann <hs@schlittermann.de> */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* BSDI-specific code. This is concatenated onto the generic
+src/os.c file. */
+
+#ifndef OS_UNSETENV
+#define OS_UNSETENV
+
+int
+os_unsetenv(const uschar * name)
+{
+unsetenv(CS name);
+return 0;
+}
diff --git a/OS/unsupported/os.c-HI-OSF b/OS/unsupported/os.c-HI-OSF
new file mode 100644
index 0000000..5e3d336
--- /dev/null
+++ b/OS/unsupported/os.c-HI-OSF
@@ -0,0 +1,35 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* HI-OSF-specific code. This is concatenated onto the generic
+src/os.c file. OSF has an apparently unique way of getting the
+load average, so we provide a unique function here, and define
+OS_LOAD_AVERAGE to stop src/os.c trying to provide the function. */
+
+#ifndef OS_LOAD_AVERAGE
+#define OS_LOAD_AVERAGE
+
+#include <sys/table.h>
+
+int
+os_getloadavg(void)
+{
+double avg;
+struct tbl_loadavg load_avg;
+
+table (TBL_LOADAVG, 0, &load_avg, 1, sizeof (load_avg));
+
+avg = (load_avg.tl_lscale == 0)?
+  load_avg.tl_avenrun.d[0] :
+  (load_avg.tl_avenrun.l[0] / (double)load_avg.tl_lscale);
+
+return (int)(avg * 1000.0);
+}
+
+#endif  /* OS_LOAD_AVERAGE */
+
+/* End of os.c-HI-OSF */
diff --git a/OS/unsupported/os.c-HP-UX b/OS/unsupported/os.c-HP-UX
new file mode 100644
index 0000000..fdd8708
--- /dev/null
+++ b/OS/unsupported/os.c-HP-UX
@@ -0,0 +1,16 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 2016 */
+/* Copyright (c) Jeremy Harris 2016 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* HP-UX-specific code. This is concatenated onto the generic
+src/os.c file. */
+
+#ifndef COMPILE_UTILITY
+# include "setenv.c"
+#endif
+
+/* End of os.c-SunHP-UX */
diff --git a/OS/unsupported/os.c-IRIX b/OS/unsupported/os.c-IRIX
new file mode 100644
index 0000000..1917238
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX
@@ -0,0 +1,119 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2022 */
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Irix-specific code. This is concatenated onto the generic src/os.c file.
+Irix has a unique way of finding all the network interfaces, so we provide a
+unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
+trying to provide the function. The macro may be set initially anyway, when
+compiling os. for utilities that don't want this function. */
+
+#ifndef FIND_RUNNING_INTERFACES
+#define FIND_RUNNING_INTERFACES
+
+/* This is the special form of the function using sysctl() which is the only
+form that returns all the aliases on IRIX systems. This code has its origins
+in a sample program that came from within SGI. */
+
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/soioctl.h>
+#include <net/route.h>
+
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
+                    : sizeof(__uint64_t))
+#ifdef _HAVE_SA_LEN
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+#else
+#define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
+#endif
+
+
+ip_address_item *
+os_find_running_interfaces(void)
+{
+ip_address_item *yield = NULL;
+ip_address_item *last = NULL;
+ip_address_item *next;
+
+size_t needed;
+int mib[6];
+char *buf, *nextaddr, *lim;
+register struct if_msghdr *ifm;
+
+mib[0] = CTL_NET;
+mib[1] = PF_ROUTE;
+mib[2] = 0;
+mib[3] = 0;
+mib[4] = NET_RT_IFLIST;
+mib[5] = 0;
+
+/* Get an estimate of the amount of store needed, then get the store and
+get the data into it. Any error causes a panic death. */
+
+if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
+    strerror(errno));
+
+buf = store_get(needed, GET_UNTAINTED);
+
+if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
+    strerror(errno));
+
+/* Now fish out the data for each interface */
+
+lim  = buf + needed;
+for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
+  {
+  ifm = (struct if_msghdr *)nextaddr;
+
+  if (ifm->ifm_type != RTM_IFINFO)
+    {
+    struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
+    struct sockaddr_in *mask = NULL, *addr = NULL;
+
+    if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
+      mask = (struct sockaddr_in *)(ifam + 1);
+
+    if ((ifam->ifam_addrs & RTA_IFA) != 0)
+      {
+      char *cp = CS mask;
+      struct sockaddr *sa = (struct sockaddr *)mask;
+      ADVANCE(cp, sa);
+      addr = (struct sockaddr_in *)cp;
+      }
+
+    /* Create a data block for the address, fill in the data, and put it on
+    the chain. This data has to survive for ever, so use malloc. */
+
+    if (addr != NULL)
+      {
+      next = store_malloc(sizeof(ip_address_item));
+      next->next = NULL;
+      next->port = 0;
+      (void)host_ntoa(-1, addr, next->address, NULL);
+
+      if (yield == NULL) yield = last = next; else
+        {
+        last->next = next;
+        last = next;
+        }
+
+      DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
+        last->address);
+      }
+    }
+  }
+
+return yield;
+}
+
+#endif  /* FIND_RUNNING_INTERFACES */
+
+/* End of os.c-IRIX */
diff --git a/OS/unsupported/os.c-IRIX6 b/OS/unsupported/os.c-IRIX6
new file mode 100644
index 0000000..1917238
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX6
@@ -0,0 +1,119 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2022 */
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Irix-specific code. This is concatenated onto the generic src/os.c file.
+Irix has a unique way of finding all the network interfaces, so we provide a
+unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
+trying to provide the function. The macro may be set initially anyway, when
+compiling os. for utilities that don't want this function. */
+
+#ifndef FIND_RUNNING_INTERFACES
+#define FIND_RUNNING_INTERFACES
+
+/* This is the special form of the function using sysctl() which is the only
+form that returns all the aliases on IRIX systems. This code has its origins
+in a sample program that came from within SGI. */
+
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/soioctl.h>
+#include <net/route.h>
+
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
+                    : sizeof(__uint64_t))
+#ifdef _HAVE_SA_LEN
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+#else
+#define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
+#endif
+
+
+ip_address_item *
+os_find_running_interfaces(void)
+{
+ip_address_item *yield = NULL;
+ip_address_item *last = NULL;
+ip_address_item *next;
+
+size_t needed;
+int mib[6];
+char *buf, *nextaddr, *lim;
+register struct if_msghdr *ifm;
+
+mib[0] = CTL_NET;
+mib[1] = PF_ROUTE;
+mib[2] = 0;
+mib[3] = 0;
+mib[4] = NET_RT_IFLIST;
+mib[5] = 0;
+
+/* Get an estimate of the amount of store needed, then get the store and
+get the data into it. Any error causes a panic death. */
+
+if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
+    strerror(errno));
+
+buf = store_get(needed, GET_UNTAINTED);
+
+if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
+    strerror(errno));
+
+/* Now fish out the data for each interface */
+
+lim  = buf + needed;
+for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
+  {
+  ifm = (struct if_msghdr *)nextaddr;
+
+  if (ifm->ifm_type != RTM_IFINFO)
+    {
+    struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
+    struct sockaddr_in *mask = NULL, *addr = NULL;
+
+    if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
+      mask = (struct sockaddr_in *)(ifam + 1);
+
+    if ((ifam->ifam_addrs & RTA_IFA) != 0)
+      {
+      char *cp = CS mask;
+      struct sockaddr *sa = (struct sockaddr *)mask;
+      ADVANCE(cp, sa);
+      addr = (struct sockaddr_in *)cp;
+      }
+
+    /* Create a data block for the address, fill in the data, and put it on
+    the chain. This data has to survive for ever, so use malloc. */
+
+    if (addr != NULL)
+      {
+      next = store_malloc(sizeof(ip_address_item));
+      next->next = NULL;
+      next->port = 0;
+      (void)host_ntoa(-1, addr, next->address, NULL);
+
+      if (yield == NULL) yield = last = next; else
+        {
+        last->next = next;
+        last = next;
+        }
+
+      DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
+        last->address);
+      }
+    }
+  }
+
+return yield;
+}
+
+#endif  /* FIND_RUNNING_INTERFACES */
+
+/* End of os.c-IRIX */
diff --git a/OS/unsupported/os.c-IRIX632 b/OS/unsupported/os.c-IRIX632
new file mode 100644
index 0000000..1917238
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX632
@@ -0,0 +1,119 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2022 */
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Irix-specific code. This is concatenated onto the generic src/os.c file.
+Irix has a unique way of finding all the network interfaces, so we provide a
+unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
+trying to provide the function. The macro may be set initially anyway, when
+compiling os. for utilities that don't want this function. */
+
+#ifndef FIND_RUNNING_INTERFACES
+#define FIND_RUNNING_INTERFACES
+
+/* This is the special form of the function using sysctl() which is the only
+form that returns all the aliases on IRIX systems. This code has its origins
+in a sample program that came from within SGI. */
+
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/soioctl.h>
+#include <net/route.h>
+
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
+                    : sizeof(__uint64_t))
+#ifdef _HAVE_SA_LEN
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+#else
+#define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
+#endif
+
+
+ip_address_item *
+os_find_running_interfaces(void)
+{
+ip_address_item *yield = NULL;
+ip_address_item *last = NULL;
+ip_address_item *next;
+
+size_t needed;
+int mib[6];
+char *buf, *nextaddr, *lim;
+register struct if_msghdr *ifm;
+
+mib[0] = CTL_NET;
+mib[1] = PF_ROUTE;
+mib[2] = 0;
+mib[3] = 0;
+mib[4] = NET_RT_IFLIST;
+mib[5] = 0;
+
+/* Get an estimate of the amount of store needed, then get the store and
+get the data into it. Any error causes a panic death. */
+
+if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
+    strerror(errno));
+
+buf = store_get(needed, GET_UNTAINTED);
+
+if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
+    strerror(errno));
+
+/* Now fish out the data for each interface */
+
+lim  = buf + needed;
+for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
+  {
+  ifm = (struct if_msghdr *)nextaddr;
+
+  if (ifm->ifm_type != RTM_IFINFO)
+    {
+    struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
+    struct sockaddr_in *mask = NULL, *addr = NULL;
+
+    if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
+      mask = (struct sockaddr_in *)(ifam + 1);
+
+    if ((ifam->ifam_addrs & RTA_IFA) != 0)
+      {
+      char *cp = CS mask;
+      struct sockaddr *sa = (struct sockaddr *)mask;
+      ADVANCE(cp, sa);
+      addr = (struct sockaddr_in *)cp;
+      }
+
+    /* Create a data block for the address, fill in the data, and put it on
+    the chain. This data has to survive for ever, so use malloc. */
+
+    if (addr != NULL)
+      {
+      next = store_malloc(sizeof(ip_address_item));
+      next->next = NULL;
+      next->port = 0;
+      (void)host_ntoa(-1, addr, next->address, NULL);
+
+      if (yield == NULL) yield = last = next; else
+        {
+        last->next = next;
+        last = next;
+        }
+
+      DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
+        last->address);
+      }
+    }
+  }
+
+return yield;
+}
+
+#endif  /* FIND_RUNNING_INTERFACES */
+
+/* End of os.c-IRIX */
diff --git a/OS/unsupported/os.c-IRIX65 b/OS/unsupported/os.c-IRIX65
new file mode 100644
index 0000000..1917238
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX65
@@ -0,0 +1,119 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2022 */
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* Irix-specific code. This is concatenated onto the generic src/os.c file.
+Irix has a unique way of finding all the network interfaces, so we provide a
+unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
+trying to provide the function. The macro may be set initially anyway, when
+compiling os. for utilities that don't want this function. */
+
+#ifndef FIND_RUNNING_INTERFACES
+#define FIND_RUNNING_INTERFACES
+
+/* This is the special form of the function using sysctl() which is the only
+form that returns all the aliases on IRIX systems. This code has its origins
+in a sample program that came from within SGI. */
+
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/soioctl.h>
+#include <net/route.h>
+
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
+                    : sizeof(__uint64_t))
+#ifdef _HAVE_SA_LEN
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+#else
+#define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
+#endif
+
+
+ip_address_item *
+os_find_running_interfaces(void)
+{
+ip_address_item *yield = NULL;
+ip_address_item *last = NULL;
+ip_address_item *next;
+
+size_t needed;
+int mib[6];
+char *buf, *nextaddr, *lim;
+register struct if_msghdr *ifm;
+
+mib[0] = CTL_NET;
+mib[1] = PF_ROUTE;
+mib[2] = 0;
+mib[3] = 0;
+mib[4] = NET_RT_IFLIST;
+mib[5] = 0;
+
+/* Get an estimate of the amount of store needed, then get the store and
+get the data into it. Any error causes a panic death. */
+
+if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
+    strerror(errno));
+
+buf = store_get(needed, GET_UNTAINTED);
+
+if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+  log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
+    strerror(errno));
+
+/* Now fish out the data for each interface */
+
+lim  = buf + needed;
+for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
+  {
+  ifm = (struct if_msghdr *)nextaddr;
+
+  if (ifm->ifm_type != RTM_IFINFO)
+    {
+    struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
+    struct sockaddr_in *mask = NULL, *addr = NULL;
+
+    if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
+      mask = (struct sockaddr_in *)(ifam + 1);
+
+    if ((ifam->ifam_addrs & RTA_IFA) != 0)
+      {
+      char *cp = CS mask;
+      struct sockaddr *sa = (struct sockaddr *)mask;
+      ADVANCE(cp, sa);
+      addr = (struct sockaddr_in *)cp;
+      }
+
+    /* Create a data block for the address, fill in the data, and put it on
+    the chain. This data has to survive for ever, so use malloc. */
+
+    if (addr != NULL)
+      {
+      next = store_malloc(sizeof(ip_address_item));
+      next->next = NULL;
+      next->port = 0;
+      (void)host_ntoa(-1, addr, next->address, NULL);
+
+      if (yield == NULL) yield = last = next; else
+        {
+        last->next = next;
+        last = next;
+        }
+
+      DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
+        last->address);
+      }
+    }
+  }
+
+return yield;
+}
+
+#endif  /* FIND_RUNNING_INTERFACES */
+
+/* End of os.c-IRIX */
diff --git a/OS/unsupported/os.c-OSF1 b/OS/unsupported/os.c-OSF1
new file mode 100644
index 0000000..ad91b63
--- /dev/null
+++ b/OS/unsupported/os.c-OSF1
@@ -0,0 +1,36 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 2001 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* OSF1-specific code. This is concatenated onto the generic src/os.c file.
+OSF1 has an apparently unique way of getting the load average, so we provide a
+unique function here, and define OS_LOAD_AVERAGE to stop src/os.c trying to
+provide the function. The macro may be set initially anyway, when compiling os.
+for utilities that don't want this function. */
+
+#ifndef OS_LOAD_AVERAGE
+#define OS_LOAD_AVERAGE
+
+#include <sys/table.h>
+
+int
+os_getloadavg(void)
+{
+double avg;
+struct tbl_loadavg load_avg;
+
+table (TBL_LOADAVG, 0, &load_avg, 1, sizeof (load_avg));
+
+avg = (load_avg.tl_lscale == 0)?
+  load_avg.tl_avenrun.d[0] :
+  (load_avg.tl_avenrun.l[0] / (double)load_avg.tl_lscale);
+
+return (int)(avg * 1000.0);
+}
+
+#endif  /* OS_LOAD_AVERAGE */
+
+/* End of os.c-OSF1 */
diff --git a/OS/unsupported/os.c-cygwin b/OS/unsupported/os.c-cygwin
new file mode 100644
index 0000000..5ca05a8
--- /dev/null
+++ b/OS/unsupported/os.c-cygwin
@@ -0,0 +1,531 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Cygwin-specific code. December 2002. Updated Jan 2015.
+   This is prefixed to the src/os.c file.
+
+   This code was supplied by Pierre A. Humblet <Pierre.Humblet@ieee.org>
+*/
+
+/* We need a special mkdir that
+   allows names starting with // */
+#undef mkdir
+int cygwin_mkdir( const char *path, mode_t mode )
+{
+  const char * p = path;
+  if (*p == '/') while(*(p+1) == '/') p++;
+  return mkdir(p, mode);
+}
+
+#ifndef COMPILE_UTILITY /* Utilities don't need special code */
+
+#ifdef INCLUDE_PAM
+#include "../pam/pam.c"
+#endif
+#include <alloca.h>
+
+unsigned int cygwin_WinVersion;
+
+/* Conflict between Windows definitions and others */
+#ifdef NOERROR
+#undef NOERROR
+#endif
+#ifdef DELETE
+#undef DELETE
+#endif
+
+#include <windows.h>
+#include <ntstatus.h>
+#include <lmcons.h>
+
+#define EqualLuid(Luid1, Luid2) \
+  ((Luid1.LowPart == Luid2.LowPart) && (Luid1.HighPart == Luid2.HighPart))
+#include <sys/cygwin.h>
+
+/* Special static variables */
+static BOOL cygwin_debug = FALSE;
+static int fakesetugid = 1; /* when not privileged, setugid = noop */
+
+#undef setuid
+int cygwin_setuid(uid_t uid )
+{
+  int res = 0;
+  if (fakesetugid == 0) { 
+    res = setuid(uid);
+    if (cygwin_debug)
+      fprintf(stderr, "setuid %u %u %d pid: %d\n",
+              uid, getuid(),res, getpid());
+  }
+  return res;
+}
+
+#undef setgid
+int cygwin_setgid(gid_t gid )
+{
+  int res = 0;
+  if (fakesetugid == 0) { 
+    res = setgid(gid);
+    if (cygwin_debug)
+      fprintf(stderr, "setgid %u %u %d pid: %d\n",
+              gid, getgid(), res, getpid());
+  }
+  return res;
+}
+
+/* Background processes run at lower priority */
+static void cygwin_setpriority()
+{
+  if (!SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS))
+    SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS);
+  return;
+}
+
+
+/* GetVersion()
+   MSB: 1 for 95/98/ME; Next 7: build number, except for 95/98/ME
+   Next byte: 0
+   Next byte: minor version of OS
+   Low  byte: major version of OS (3 or 4 for for NT, 5 for 2000 and XP) */
+//#define VERSION_IS_58M(x) (x & 0x80000000) /* 95, 98, Me   */
+//#define VERSION_IS_NT(x)  ((x & 0XFF) < 5) /* NT 4 or 3.51 */
+
+/*
+  Routine to find if process or thread is privileged
+*/
+
+enum {
+  CREATE_BIT = 1,
+};
+
+static DWORD get_privileges ()
+{
+  char buffer[1024];
+  DWORD i, length;
+  HANDLE hToken = NULL;
+  PTOKEN_PRIVILEGES privs;
+  LUID cluid, rluid;
+  DWORD ret = 0;
+
+  privs = (PTOKEN_PRIVILEGES) buffer;
+
+  if (OpenProcessToken (GetCurrentProcess(), TOKEN_QUERY, &hToken)
+      && LookupPrivilegeValue (NULL, SE_CREATE_TOKEN_NAME, &cluid)
+      && LookupPrivilegeValue(NULL, SE_RESTORE_NAME, &rluid)
+      && (GetTokenInformation( hToken, TokenPrivileges,
+                               privs, sizeof (buffer), &length)
+          || (GetLastError () == ERROR_INSUFFICIENT_BUFFER
+              && (privs = (PTOKEN_PRIVILEGES) alloca (length))
+              && GetTokenInformation(hToken, TokenPrivileges,
+                                     privs, length, &length)))) {
+    for (i = 0; i < privs->PrivilegeCount; i++) {
+      if (EqualLuid(privs->Privileges[i].Luid, cluid))
+        ret |= CREATE_BIT;
+      if (ret == (CREATE_BIT))
+        break;
+    }
+  }
+  else
+    fprintf(stderr, "has_create_token_privilege %u\n", GetLastError());
+
+  if (hToken)
+    CloseHandle(hToken);
+
+  return ret;
+}
+
+/* 
+  We use cygwin_premain to fake a few things 
+	and to provide some debug info 
+*/
+void cygwin_premain2(int argc, char ** argv, struct per_process * ptr)
+{
+  int i, res, is_daemon = 0, is_spoolwritable, is_privileged, is_eximuser;
+  uid_t myuid, systemuid;
+  gid_t mygid, adminsgid;
+  struct passwd * pwp = NULL;
+  struct stat buf;
+  char *cygenv;
+  SID(1, SystemSid, SECURITY_LOCAL_SYSTEM_RID);
+  SID(2, AdminsSid, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS);
+  DWORD priv_flags;
+
+  myuid = getuid();
+  mygid = getgid();
+  cygwin_WinVersion = GetVersion();
+  if ((cygenv = getenv("CYGWIN")) == NULL) cygenv = "";
+  /* Produce some debugging on stderr,
+     cannot yet use exim's debug functions.
+     Exim does not use -c and ignores -n.
+     Set lower priority for daemons */
+  for (i = 1; i < argc; i++) {
+    if (argv[i][0] == '-') {
+      if (argv[i][1] == 'c') {
+        ssize_t size;
+        wchar_t *win32_path;
+        argv[i][1] = 'n';  /* Replace -c by -n */
+        cygwin_debug = TRUE;
+        fprintf(stderr, "CYGWIN = \"%s\".\n", cygenv);
+        if (((size = cygwin_conv_path(CCP_POSIX_TO_WIN_W,"/", win32_path, 0)) > 0)
+ 	 && ((win32_path = store_malloc(size)) != NULL)
+         && (cygwin_conv_path(CCP_POSIX_TO_WIN_W,"/", win32_path, size) == 0)) {
+	        fprintf(stderr, " Root / mapped to %ls.\n", win32_path);
+		store_free(win32_path);
+	}
+      }
+      else if (argv[i][1] == 'b' && argv[i][2] == 'd') {
+        is_daemon = 1;
+        cygwin_setpriority();
+    }
+  }
+  }
+
+  /* Nt/2000/XP
+     We initially set the exim uid & gid to those of the "exim user",
+       or to the root uid (SYSTEM) and exim gid (ADMINS),
+     If privileged, we setuid to those.
+     We always set the configure uid to the system uid.
+     We always set the root uid to the real uid
+       to allow exim imposed restrictions (bypassable by recompiling)
+       and to avoid exec that cause loss of privilege
+     If not privileged and unable to chown,
+       we set the exim uid to our uid.
+     If unprivileged and /var/spool/exim is writable and not running as listening daemon, 
+       we fake all subsequent setuid. */
+
+  /* Get the system and admins uid from their sids */
+  if ((systemuid = cygwin_internal(CW_GET_UID_FROM_SID, & SystemSid)) == -1) {
+	fprintf(stderr, "Cannot map System sid. Aborting\n");
+	exit(1);
+  }
+  if ((adminsgid = cygwin_internal(CW_GET_GID_FROM_SID, & AdminsSid)) == -1) {
+	fprintf(stderr, "Cannot map Admins sid. Aborting\n");
+	exit(1);
+  }
+
+  priv_flags = get_privileges ();
+  is_privileged = !!(priv_flags & CREATE_BIT);
+
+  /* Call getpwnam for account exim after getting the local exim name */
+  char exim_username[DNLEN + UNLEN + 2];
+  if (cygwin_internal(CW_CYGNAME_FROM_WINNAME, "exim", exim_username, sizeof exim_username) != 0)
+     pwp = getpwnam (exim_username);
+
+  /* If cannot setuid to exim or and is not the daemon (which is assumed to be
+     able to chown or to be the exim user) set the exim ugid to our ugid to avoid
+     chown failures after creating files and to be able to setuid to exim in 
+     exim.c ( "privilege not needed" ). */
+  if ((is_privileged == 0) && (!is_daemon)) {
+    exim_uid = myuid;
+    exim_gid = mygid;
+  }
+  else if (pwp != NULL) {
+    exim_uid = pwp->pw_uid;  /* Set it according to passwd */
+    exim_gid = pwp->pw_gid;
+    is_eximuser = 1;
+  }
+  else {
+    exim_uid = systemuid;
+    exim_gid = adminsgid;
+    is_eximuser = 0;
+  }
+
+  res = stat("/var/spool/exim", &buf);
+  /* Check if writable (and can be stat) */
+  is_spoolwritable = ((res == 0) && ((buf.st_mode & S_IWOTH) != 0));
+
+  fakesetugid = (is_privileged == 0) && (is_daemon == 0) && (is_spoolwritable == 1);
+
+  if (is_privileged) {             /* Can setuid */
+     if (cygwin_setgid(exim_gid) /* Setuid to exim */
+         || cygwin_setuid(exim_uid)) {
+	   fprintf(stderr, "Unable to setuid/gid to exim. priv_flags: %x\n", priv_flags);
+      	   exit(0);          /* Problem... Perhaps not in 544 */
+     }
+  }
+
+  /* Set the configuration file uid and gid to the system uid and admins gid. */
+  config_uid = systemuid;
+  config_gid = adminsgid;
+
+  /* Pretend we are root to avoid useless exec
+     and avoid exim set limitations.
+     We are limited by file access rights */
+  root_uid = getuid ();
+
+  if (cygwin_debug) {
+    fprintf(stderr, "Starting uid %u, gid %u, priv_flags %x, is_privileged %d, is_daemon %d, is_spoolwritable %d.\n",
+            myuid, mygid, priv_flags, is_privileged, is_daemon, is_spoolwritable);
+    fprintf(stderr, "root_uid %u, exim_uid %u, exim_gid %u, config_uid %u, config_gid %u, is_eximuser %d.\n",
+            root_uid, exim_uid, exim_gid, config_uid, config_gid, is_eximuser);
+  }
+  return;
+}
+
+#ifndef OS_LOAD_AVERAGE /* Can be set on command line */
+#define OS_LOAD_AVERAGE /* src/os.c need not provide it */
+
+/*****************************************************************
+ Functions for average load measurements
+
+ Uses NtQuerySystemInformation.
+ This requires definitions that are not part of
+ standard include files.
+
+ This is discouraged starting with WinXP.
+
+*************************************************************/
+/* Structure to compute the load average efficiently */
+typedef struct {
+  DWORD Lock;
+  unsigned long long Time100ns;   /* Last measurement time */
+  unsigned long long IdleCount;   /* Latest cumulative idle time */
+  unsigned long long LastCounter; /* Last measurement counter */
+  unsigned long long PerfFreq;    /* Perf counter frequency */
+  int LastLoad;                   /* Last reported load, or -1 */
+} cygwin_perf_t;
+
+static struct {
+   HANDLE handle;
+   pid_t pid;
+   cygwin_perf_t *perf;
+} cygwin_load = {NULL, 0, NULL};
+
+#include <ntdef.h>
+
+typedef enum _SYSTEM_INFORMATION_CLASS
+{
+  SystemBasicInformation = 0,
+  SystemPerformanceInformation = 2,
+  SystemTimeOfDayInformation = 3,
+  SystemProcessesAndThreadsInformation = 5,
+  SystemProcessorTimes = 8,
+  SystemPagefileInformation = 18,
+  /* There are a lot more of these... */
+} SYSTEM_INFORMATION_CLASS;
+
+typedef struct _SYSTEM_BASIC_INFORMATION
+{
+  ULONG Unknown;
+  ULONG MaximumIncrement;
+  ULONG PhysicalPageSize;
+  ULONG NumberOfPhysicalPages;
+  ULONG LowestPhysicalPage;
+  ULONG HighestPhysicalPage;
+  ULONG AllocationGranularity;
+  ULONG LowestUserAddress;
+  ULONG HighestUserAddress;
+  ULONG ActiveProcessors;
+  UCHAR NumberProcessors;
+} SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
+
+typedef struct __attribute__ ((aligned (8))) _SYSTEM_PROCESSOR_TIMES
+{
+  LARGE_INTEGER IdleTime;
+  LARGE_INTEGER KernelTime;
+  LARGE_INTEGER UserTime;
+  LARGE_INTEGER DpcTime;
+  LARGE_INTEGER InterruptTime;
+  ULONG InterruptCount;
+} SYSTEM_PROCESSOR_TIMES, *PSYSTEM_PROCESSOR_TIMES;
+
+typedef NTSTATUS NTAPI (*NtQuerySystemInformation_t) (SYSTEM_INFORMATION_CLASS, PVOID, ULONG, PULONG);
+typedef ULONG NTAPI (*RtlNtStatusToDosError_t) (NTSTATUS);
+
+static NtQuerySystemInformation_t NtQuerySystemInformation;
+static RtlNtStatusToDosError_t RtlNtStatusToDosError;
+
+/*****************************************************************
+ *
+ LoadNtdll()
+ Load special functions from the NTDLL
+ Return TRUE if success.
+
+ *****************************************************************/
+
+static BOOL LoadNtdll()
+{
+  HINSTANCE hinstLib;
+
+  if ((hinstLib = LoadLibrary("NTDLL.DLL"))
+      && (NtQuerySystemInformation =
+          (NtQuerySystemInformation_t) GetProcAddress(hinstLib,
+                                                        "NtQuerySystemInformation"))
+      && (RtlNtStatusToDosError =
+          (RtlNtStatusToDosError_t) GetProcAddress(hinstLib,
+                                                     "RtlNtStatusToDosError")))
+    return TRUE;
+
+  DEBUG(D_load)
+    debug_printf("perf: load: %u (Windows)\n", GetLastError());
+  return FALSE;
+}
+/*****************************************************************
+ *
+ ReadStat()
+ Measures current Time100ns and IdleCount
+ Return TRUE if success.
+
+ *****************************************************************/
+
+static BOOL ReadStat(unsigned long long int *Time100nsPtr,
+                     unsigned long long int *IdleCountPtr)
+{
+  NTSTATUS ret;
+  SYSTEM_BASIC_INFORMATION sbi;
+  PSYSTEM_PROCESSOR_TIMES spt;
+
+  *Time100nsPtr = *IdleCountPtr = 0;
+
+  if ((ret = NtQuerySystemInformation(SystemBasicInformation,
+                                      (PVOID) &sbi, sizeof sbi, NULL))
+      != STATUS_SUCCESS) {
+    DEBUG(D_load)
+      debug_printf("Perf: NtQuerySystemInformation: %u (Windows)\n",
+                   RtlNtStatusToDosError(ret));
+  }
+  else if (!(spt = (PSYSTEM_PROCESSOR_TIMES) alloca(sizeof(spt[0]) * sbi.NumberProcessors))) {
+    DEBUG(D_load)
+      debug_printf("Perf: alloca: errno %d (%s)\n", errno, strerror(errno));
+  }
+  else if ((ret = NtQuerySystemInformation(SystemProcessorTimes, (PVOID) spt,
+                                           sizeof spt[0] * sbi.NumberProcessors, NULL))
+           != STATUS_SUCCESS) {
+    DEBUG(D_load)
+      debug_printf("Perf: NtQuerySystemInformation: %u (Windows)\n",
+                   RtlNtStatusToDosError(ret));
+  }
+  else {
+    int i;
+    for (i = 0; i < sbi.NumberProcessors; i++) {
+      *Time100nsPtr += spt[i].KernelTime.QuadPart;;
+      *Time100nsPtr += spt[i].UserTime.QuadPart;
+      *IdleCountPtr += spt[i].IdleTime.QuadPart;
+    }
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/*****************************************************************
+ *
+ InitLoadAvg()
+ Initialize the cygwin_load.perf structure.
+ and set cygwin_load.perf->Flag to TRUE if successful.
+ This is called the first time os_getloadavg is called
+ *****************************************************************/
+static void InitLoadAvg(cygwin_perf_t *this)
+{
+  BOOL success = TRUE;
+
+  /* Get perf frequency and counter */
+  QueryPerformanceFrequency((LARGE_INTEGER *)& this->PerfFreq);
+  QueryPerformanceCounter((LARGE_INTEGER *)& this->LastCounter);
+
+  /* Get initial values for Time100ns and IdleCount */
+  success = success
+            && ReadStat( & this->Time100ns,
+                         & this->IdleCount);
+  /* If success, set the Load to 0, else to -1 */
+  if (success) this->LastLoad = 0;
+  else {
+    log_write(0, LOG_MAIN, "Cannot obtain Load Average");
+    this->LastLoad = -1;
+  }
+}
+
+
+/*****************************************************************
+ *
+ os_getloadavg()
+
+ Return -1 if not available;
+ Return the previous value if less than AVERAGING sec old.
+ else return the processor load on a [0 - 1000] scale.
+
+ The first time we are called we initialize the counts
+ and return 0 or -1.
+ The initial load cannot be measured as we use the processor 100%
+*****************************************************************/
+static SECURITY_ATTRIBUTES sa = {sizeof (SECURITY_ATTRIBUTES), NULL, TRUE};
+#define AVERAGING 10
+
+int os_getloadavg()
+{
+  unsigned long long Time100ns, IdleCount, CurrCounter;
+  int value;
+  pid_t newpid;
+
+  /* New process.
+     Reload the dlls and the file mapping */
+  if ((newpid = getpid()) != cygwin_load.pid) {
+    BOOL new;
+    cygwin_load.pid = newpid;
+
+    if (!LoadNtdll()) {
+      log_write(0, LOG_MAIN, "Cannot obtain Load Average");
+      cygwin_load.perf = NULL;
+      return -1;
+    }
+
+    if ((new = !cygwin_load.handle)) {
+      cygwin_load.handle = CreateFileMapping (INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE,
+                                              0, sizeof(cygwin_perf_t), NULL);
+      DEBUG(D_load)
+        debug_printf("Perf: CreateFileMapping: handle %p\n", (void *) cygwin_load.handle);
+    }
+    cygwin_load.perf = (cygwin_perf_t *) MapViewOfFile (cygwin_load.handle,
+                                                        FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
+    DEBUG(D_load)
+      debug_printf("Perf: MapViewOfFile: addr %p\n", (void *) cygwin_load.perf);
+    if (new && cygwin_load.perf)
+      InitLoadAvg(cygwin_load.perf);
+  }
+
+  /* Check if initialized OK */
+  if (!cygwin_load.perf || cygwin_load.perf->LastLoad < 0)
+    return -1;
+
+  /* If we cannot get the lock, we return 0.
+     This is to prevent any lock-up possibility.
+     Finding a lock busy is unlikely, and giving up only
+     results in an immediate delivery .*/
+
+  if (InterlockedCompareExchange(&cygwin_load.perf->Lock, 1, 0)) {
+    DEBUG(D_load)
+      debug_printf("Perf: Lock busy\n");
+    return 0;
+  }
+
+    /* Get the current time (PerfCounter) */
+    QueryPerformanceCounter((LARGE_INTEGER *)& CurrCounter);
+    /* Calls closer than AVERAGING sec apart use the previous value */
+  if (CurrCounter - cygwin_load.perf->LastCounter >
+      AVERAGING * cygwin_load.perf->PerfFreq) {
+      /* Get Time100ns and IdleCount */
+      if (ReadStat( & Time100ns, & IdleCount)) { /* Success */
+        /* Return processor load on 1000 scale */
+      value = 1000 - ((1000 * (IdleCount - cygwin_load.perf->IdleCount)) /
+                      (Time100ns - cygwin_load.perf->Time100ns));
+      cygwin_load.perf->Time100ns = Time100ns;
+      cygwin_load.perf->IdleCount = IdleCount;
+      cygwin_load.perf->LastCounter = CurrCounter;
+      cygwin_load.perf->LastLoad = value;
+      DEBUG(D_load)
+        debug_printf("Perf: New load average %d\n", value);
+      }
+      else { /* Something bad happened.
+                Refuse to measure the load anymore
+                but don't bother releasing the buffer */
+        log_write(0, LOG_MAIN, "Cannot obtain Load Average");
+      cygwin_load.perf->LastLoad = -1;
+    }
+  }
+  else
+  DEBUG(D_load)
+      debug_printf("Perf: Old load average %d\n", cygwin_load.perf->LastLoad);
+  cygwin_load.perf->Lock = 0;
+  return cygwin_load.perf->LastLoad;
+}
+#endif /* OS_LOAD_AVERAGE */
+#endif /* COMPILE_UTILITY */
diff --git a/OS/unsupported/os.h-AIX b/OS/unsupported/os.h-AIX
new file mode 100644
index 0000000..5cd4501
--- /dev/null
+++ b/OS/unsupported/os.h-AIX
@@ -0,0 +1,27 @@
+/* Exim: OS-specific C header file for AIX */
+/* Written by Nick Waterman <nick@cimio.co.uk> */
+/* Modified by Philip Hazel with data from
+   Niels Provos <provos@wserver.physnet.uni-hamburg.de>
+   Juozas Simkevicius <juozas@omnitel.net> for load averages
+*/
+
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define LOAD_AVG_TYPE   int
+#define FSCALE          65536.0
+
+#define HAVE_SYS_VFS_H
+#define HAVE_SYS_STATFS_H
+
+/* Now tell AIX to emulate BSD as badly as it can. */
+
+#define _BSD 44
+
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+
+/* End */
diff --git a/OS/unsupported/os.h-BSDI b/OS/unsupported/os.h-BSDI
new file mode 100644
index 0000000..a1705ec
--- /dev/null
+++ b/OS/unsupported/os.h-BSDI
@@ -0,0 +1,15 @@
+/* Exim: OS-specific C header file for BSDI */
+
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_SETCLASSRESOURCES
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define SIOCGIFCONF_GIVES_ADDR
+#define OS_UNSETENV
+
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-DGUX b/OS/unsupported/os.h-DGUX
new file mode 100644
index 0000000..9040f0e
--- /dev/null
+++ b/OS/unsupported/os.h-DGUX
@@ -0,0 +1,28 @@
+/* Exim: OS-specific C header file for DGUX */
+
+/* Written by Ken Bailey (K.Bailey@rbgkew.org.uk) Feb 1998 */
+/* on dgux R4.11MU04 generic AViiON mc88100                */
+/* Modified Dec 1998 by PH after message from Ken.         */
+
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL                 f_favail
+
+#define NO_SYSEXITS              /* DGUX doesn't ship sysexits.h */
+#define NO_IP_VAR_H              /* DGUX has no netinet/ip_var.h */
+
+#define os_strsignal             dg_strsignal
+#define OS_STRSIGNAL
+
+#define HAVE_MMAP
+
+/* The definition of ipoptions in netinet/in.h (masquerading as ip_opts) used
+in smtp_in.c is for Intel DG _IX86_ABI only. You may be able to get this to
+work on Intel DG but it's certainly easier to skip it on M88k. This means we
+forego the detection of some source-routing based IP attacks. */
+
+#define NO_IP_OPTIONS
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-Darwin b/OS/unsupported/os.h-Darwin
new file mode 100644
index 0000000..a85e92f
--- /dev/null
+++ b/OS/unsupported/os.h-Darwin
@@ -0,0 +1,64 @@
+/* Exim: OS-specific C header file for Darwin (Mac OS X) */
+
+/* #define CRYPT_H */  /* Apparently this isn't needed */
+
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define PAM_H_IN_PAM
+#define SIOCGIFCONF_GIVES_ADDR
+#define EXIM_HAVE_OPENAT
+
+
+#define F_FREESP     O_TRUNC
+typedef struct flock flock_t;
+
+#define BASE_62 36  /* HFS+ aliases lower and upper cases in filenames.
+                               Consider reducing MAX_LOCALHOST_NUMBER */
+
+#ifndef        _BSD_SOCKLEN_T_
+# define _BSD_SOCKLEN_T_ int32_t                 /* socklen_t (duh) */
+#endif
+
+/* Settings for handling IP options. There's no netinet/ip_var.h. The IP
+option handling is in the style of the later GLIBCs but the GLIBC macros
+aren't set, so we invent a new one. */
+
+#define NO_IP_VAR_H
+#define DARWIN_IP_OPTIONS
+
+/* Need this for the DNS lookup code. Remember to remove if we get round to
+updating Exim to use the newer interface. */
+
+#define BIND_8_COMPAT
+
+/* It's not .so for dynamic libraries on Darwin. */
+#define DYNLIB_FN_EXT "dylib"
+
+/* We currently need some assistance getting OFF_T_FMT correct on MacOS */
+#ifdef OFF_T_FMT
+# undef OFF_T_FMT
+#endif
+#define OFF_T_FMT "%lld"
+#define LONGLONG_T long int
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* seems arpa/nameser.h does not define this */
+#define NS_MAXMSG 65535
+
+/* There may be very many supplementary groups for the user. See notes
+in "man 2 getgroups". */
+#define _DARWIN_UNLIMITED_GETGROUPS
+#define EXIM_GROUPLIST_SIZE 64
+
+/* TCP Fast Open: Darwin uses a connectx() call
+rather than a modified sendto() */
+#define EXIM_TFO_CONNECTX
+
+/* MacOS, at least on the buildfarm animal, does not seem to push out
+the SMTP response to QUIT with our usual handling which is trying to get
+the client to FIN first so that the server does not get the TIME_WAIT */
+#define SERVERSIDE_CLOSE_NOWAIT
+
+/* End */
diff --git a/OS/unsupported/os.h-DragonFly b/OS/unsupported/os.h-DragonFly
new file mode 100644
index 0000000..4c2f1d5
--- /dev/null
+++ b/OS/unsupported/os.h-DragonFly
@@ -0,0 +1,13 @@
+/* Exim: OS-specific C header file for DragonFly */
+
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define SIOCGIFCONF_GIVES_ADDR
+
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-GNUkFreeBSD b/OS/unsupported/os.h-GNUkFreeBSD
new file mode 100644
index 0000000..ab35031
--- /dev/null
+++ b/OS/unsupported/os.h-GNUkFreeBSD
@@ -0,0 +1,25 @@
+/* Exim: OS-specific C header file for GNU/kFreeBSD */
+
+#define CRYPT_H
+#define GLIBC_IP_OPTIONS
+#define HAVE_MMAP
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_SYS_VFS_H
+#define NO_IP_VAR_H
+#define SIG_IGN_WORKS
+
+#define F_FREESP     O_TRUNC
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+/* kFreeBSD-specific bits below */
+
+#define HAVE_SYS_MOUNT_H
+#define SIOCGIFCONF_GIVES_ADDR
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-GNUkNetBSD b/OS/unsupported/os.h-GNUkNetBSD
new file mode 100644
index 0000000..bc3bc25
--- /dev/null
+++ b/OS/unsupported/os.h-GNUkNetBSD
@@ -0,0 +1,25 @@
+/* Exim: OS-specific C header file for GNU/kNetBSD */
+
+#define CRYPT_H
+#define GLIBC_IP_OPTIONS
+#define HAVE_MMAP
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_SYS_VFS_H
+#define NO_IP_VAR_H
+#define SIG_IGN_WORKS
+
+#define F_FREESP     O_TRUNC
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+/* kNetBSD-specific bits below */
+
+#define HAVE_SYS_MOUNT_H
+#define SIOCGIFCONF_GIVES_ADDR
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-HI-OSF b/OS/unsupported/os.h-HI-OSF
new file mode 100644
index 0000000..0f50fb6
--- /dev/null
+++ b/OS/unsupported/os.h-HI-OSF
@@ -0,0 +1,12 @@
+/* Exim: OS-specific C header file for HI-OSF/1-MJ and HI-UX/MPP */
+
+#define HAVE_SYS_MOUNT_H
+
+typedef struct flock           flock_t;
+#define F_FREESP               O_TRUNC
+#define DN_EXPAND_ARG4_TYPE    u_char *
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-HI-UX b/OS/unsupported/os.h-HI-UX
new file mode 100644
index 0000000..f3df963
--- /dev/null
+++ b/OS/unsupported/os.h-HI-UX
@@ -0,0 +1,21 @@
+/* Exim: OS-specific C header file for HI-UX */
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE       double
+#define LOAD_AVG_SYMBOL     "avenrun"
+#define KERNEL_PATH         "/HI-UX"
+#define FSCALE              1.0
+
+#define HAVE_SYS_VFS_H
+
+#define SELECT_ARG2_TYPE    int
+#define F_FREESP            O_TRUNC
+#define NEED_H_ERRNO        1
+
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-HP-UX b/OS/unsupported/os.h-HP-UX
new file mode 100644
index 0000000..4998734
--- /dev/null
+++ b/OS/unsupported/os.h-HP-UX
@@ -0,0 +1,34 @@
+/* Exim: OS-specific C header file for HP-UX versions greater than 9 */
+
+#define EXIM_SOCKLEN_T size_t
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   double
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/stand/vmunix"
+#define FSCALE          1.0
+
+#define HAVE_SYS_STATVFS_H
+
+#define F_FREESP           O_TRUNC
+#define NEED_H_ERRNO       1
+
+typedef struct flock flock_t;
+
+typedef struct __res_state *res_state;
+
+#define LLONG_MIN LONG_LONG_MIN
+#define LLONG_MAX LONG_LONG_MAX
+
+#define strtoll(a,b,c) strtoimax(a,b,c)
+
+/* Determined by sockaddr_un */
+
+struct sockaddr_storage
+{
+  short ss_family;
+  char __ss_padding[92];
+};
+
+/* End */
diff --git a/OS/unsupported/os.h-HP-UX-9 b/OS/unsupported/os.h-HP-UX-9
new file mode 100644
index 0000000..5a260d6
--- /dev/null
+++ b/OS/unsupported/os.h-HP-UX-9
@@ -0,0 +1,23 @@
+/* Exim: OS-specific C header file for HP-UX version 9 */
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   double
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/hp-ux"
+#define FSCALE          1.0
+
+#define HAVE_SYS_VFS_H
+
+#define SELECT_ARG2_TYPE   int
+#define F_FREESP           O_TRUNC
+#define NEED_H_ERRNO       1
+
+#define killpg(pgid,sig)   kill(-(pgid),sig)
+
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-IRIX b/OS/unsupported/os.h-IRIX
new file mode 100644
index 0000000..1d4bf46
--- /dev/null
+++ b/OS/unsupported/os.h-IRIX
@@ -0,0 +1,17 @@
+/* Exim: OS-specific C header file for IRIX */
+
+#define DN_EXPAND_ARG4_TYPE  u_char *
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          1000.0
+
+#define HAVE_MMAP
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define vfork fork
+
+/* End */
diff --git a/OS/unsupported/os.h-IRIX6 b/OS/unsupported/os.h-IRIX6
new file mode 100644
index 0000000..bf30767
--- /dev/null
+++ b/OS/unsupported/os.h-IRIX6
@@ -0,0 +1,16 @@
+/* Exim: OS-specific C header file for IRIX */
+
+#define CRYPT_H
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          1000.0
+
+#define HAVE_MMAP
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define vfork fork
+
+/* End */
diff --git a/OS/unsupported/os.h-IRIX632 b/OS/unsupported/os.h-IRIX632
new file mode 100644
index 0000000..90f1c58
--- /dev/null
+++ b/OS/unsupported/os.h-IRIX632
@@ -0,0 +1,18 @@
+/* Exim: OS-specific C header file for IRIX */
+
+#define CRYPT_H
+#define DN_EXPAND_ARG4_TYPE  u_char *
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          1000.0
+
+#define HAVE_MMAP
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define vfork fork
+
+/* End */
diff --git a/OS/unsupported/os.h-IRIX65 b/OS/unsupported/os.h-IRIX65
new file mode 100644
index 0000000..4b248fe
--- /dev/null
+++ b/OS/unsupported/os.h-IRIX65
@@ -0,0 +1,16 @@
+/* Exim: OS-specific C header file for IRIX 6.5 */
+
+#define CRYPT_H
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          1000.0
+
+#define HAVE_MMAP
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define vfork fork
+
+/* End */
diff --git a/OS/unsupported/os.h-NetBSD b/OS/unsupported/os.h-NetBSD
new file mode 100644
index 0000000..0b9fc03
--- /dev/null
+++ b/OS/unsupported/os.h-NetBSD
@@ -0,0 +1,31 @@
+/* Exim: OS-specific C header file for NetBSD */
+/* Copyright (c) The Exim Maintainers 2021 */
+
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_GETIFADDRS
+#define HAVE_MMAP
+#define HAVE_SYS_MOUNT_H
+#define SIOCGIFCONF_GIVES_ADDR
+#define HAVE_ARC4RANDOM
+
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+#define os_get_dns_resolver_res __res_get_state
+#define os_put_dns_resolver_res(RP) __res_put_state(RP)
+#define OS_GET_DNS_RESOLVER_RES
+
+#include <sys/param.h>
+
+#if __NetBSD_Version__ >= 299000900
+#define HAVE_SYS_STATVFS_H
+#endif
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+#define EXIM_HAVE_KEVENT
+
+/* End */
diff --git a/OS/unsupported/os.h-NetBSD-a.out b/OS/unsupported/os.h-NetBSD-a.out
new file mode 100644
index 0000000..29a8fee
--- /dev/null
+++ b/OS/unsupported/os.h-NetBSD-a.out
@@ -0,0 +1,5 @@
+/* Exim: OS-specific C header file for NetBSD (a.out binary format) */
+
+#include "../OS/os.h-NetBSD"     /* Same as for ELF format */
+
+/* End */
diff --git a/OS/unsupported/os.h-OSF1 b/OS/unsupported/os.h-OSF1
new file mode 100644
index 0000000..6b5fa49
--- /dev/null
+++ b/OS/unsupported/os.h-OSF1
@@ -0,0 +1,16 @@
+/* Exim: OS-specific C header file for OSF1 */
+
+#define HAVE_SYS_MOUNT_H
+#define HAVE_GETIPNODEBYNAME    1
+
+typedef struct flock flock_t;
+#define F_FREESP     O_TRUNC
+
+/* This was here for some time, but it seems that now (June 2005) things have
+changed. */
+/* #define EXIM_SOCKLEN_T    size_t */
+
+/* Still not "socklen_t", which is the most common setting */
+#define EXIM_SOCKLEN_T       int
+
+/* End */
diff --git a/OS/unsupported/os.h-OpenUNIX b/OS/unsupported/os.h-OpenUNIX
new file mode 100644
index 0000000..67d1063
--- /dev/null
+++ b/OS/unsupported/os.h-OpenUNIX
@@ -0,0 +1,19 @@
+/* Exim: OS-specific C header file for OpenUNIX */
+
+#define NO_SYSEXITS
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/stand/unix"
+#define FSCALE          256
+
+#define HAVE_SYS_STATVFS_H
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-QNX b/OS/unsupported/os.h-QNX
new file mode 100644
index 0000000..798f799
--- /dev/null
+++ b/OS/unsupported/os.h-QNX
@@ -0,0 +1,24 @@
+/* Exim: OS-specific C header file for QNX */
+/* Modified for QNX 6.2.0 with diffs from Samuli Tuomola. */
+
+#include <sys/select.h>
+
+/* This include is wrapped in an ifdef so as to be skipped for QNXRTP, which
+doesn't have/need this header file. From Karsten P. Hoffmann. */
+
+#ifdef __QNX__
+#include <unix.h>
+#endif
+
+#undef HAVE_STATFS
+#undef HAVE_VFS_H
+#undef HAVE_SYS_MOUNT_H
+
+#define NO_SYSEXITS
+
+extern int h_errno;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-SCO b/OS/unsupported/os.h-SCO
new file mode 100644
index 0000000..e5e915e
--- /dev/null
+++ b/OS/unsupported/os.h-SCO
@@ -0,0 +1,21 @@
+/* Exim: OS-specific C header file for SCO */
+
+#define DN_EXPAND_ARG4_TYPE    u_char *
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          256
+#define EXIM_SOCKLEN_T  int
+
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-SCO_SV b/OS/unsupported/os.h-SCO_SV
new file mode 100644
index 0000000..0ca29f7
--- /dev/null
+++ b/OS/unsupported/os.h-SCO_SV
@@ -0,0 +1,19 @@
+/* Exim: OS-specific C header file for SCO_SV */
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/unix"
+#define FSCALE          256
+#define EXIM_SOCKLEN_T  int
+
+#define HAVE_SYS_STATVFS_H
+#define F_FAVAIL        f_favail
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-SunOS4 b/OS/unsupported/os.h-SunOS4
new file mode 100644
index 0000000..6555620
--- /dev/null
+++ b/OS/unsupported/os.h-SunOS4
@@ -0,0 +1,39 @@
+/* Exim: OS-specific C header file for SunOS4 */
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "_avenrun"
+#define KERNEL_PATH     "/vmunix"
+
+#define HAVE_MMAP
+#define HAVE_SYS_VFS_H
+
+#define F_FREESP     O_TRUNC
+#define EXIT_FAILURE 1
+#define EXIT_SUCCESS 0
+typedef struct flock flock_t;
+
+#define STRERROR_FROM_ERRLIST
+#define memmove(a, b, c) bcopy(b, a, c)
+#define strtoul(str, ptr, base) ((unsigned int)strtol((str),(ptr),(base)))
+
+extern char *strerror(int);
+extern int   sys_nerr;
+extern char *sys_errlist[];
+
+/* In ANSI C strtod() is defined in stdlib.h, but in SunOS4 it is defined in
+floatingpoint.h which is called from math.h, which Exim doesn't include. */
+
+extern double strtod(const char *, char **);
+
+/* SunOS4 seems to define getc, ungetc, feof and ferror as macros only, not
+as functions. We need to have them as assignable functions. Setting this
+flag causes this to get done in exim.h. */
+
+#define FUDGE_GETC_AND_FRIENDS
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-SunOS5-hal b/OS/unsupported/os.h-SunOS5-hal
new file mode 100644
index 0000000..cd9e877
--- /dev/null
+++ b/OS/unsupported/os.h-SunOS5-hal
@@ -0,0 +1,14 @@
+/* Exim: OS-specific C header file for SunOS5 on HAL */
+
+#define HAVE_MMAP
+
+#define HAVE_KSTAT
+#define LOAD_AVG_KSTAT        "system_misc"
+#define LOAD_AVG_KSTAT_MODULE "unix"
+#define LOAD_AVG_SYMBOL       "avenrun_1min"
+#define LOAD_AVG_FIELD         value.ul
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-ULTRIX b/OS/unsupported/os.h-ULTRIX
new file mode 100644
index 0000000..08db5ae
--- /dev/null
+++ b/OS/unsupported/os.h-ULTRIX
@@ -0,0 +1,18 @@
+/* Exim: OS-specific C header file for Ultrix */
+
+/* Well, it *does* have statfs(), but its structure is called something
+different, all the members have different names, and the function returns
+1 on success rather than 0. As this is for a minority function, and I think
+a minority operating system, easiest just to say "no" until someone asks. */
+
+#undef HAVE_STATFS
+
+#define F_FREESP     O_TRUNC
+#define NEED_H_ERRNO
+#define NO_OPENLOG
+typedef struct flock flock_t;
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-UNIX_SV b/OS/unsupported/os.h-UNIX_SV
new file mode 100644
index 0000000..4943a07
--- /dev/null
+++ b/OS/unsupported/os.h-UNIX_SV
@@ -0,0 +1,25 @@
+/* Exim: OS-specific C header file for SCO SVR4.2 (and maybe Unixware) */
+
+/**
+*** Note that for SCO 5 the configuration file is called SCO_SV,
+*** and that Unixware7 has its own configuration. This is an old
+*** file that is retained for compatibility.
+**/
+
+#define NO_SYSEXITS
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/stand/unix"
+#define FSCALE          256
+
+#define HAVE_SYS_STATVFS_H
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-USG b/OS/unsupported/os.h-USG
new file mode 100644
index 0000000..e769220
--- /dev/null
+++ b/OS/unsupported/os.h-USG
@@ -0,0 +1,19 @@
+/* Exim: OS-specific C header file for Unixware 2.x */
+
+#define NO_SYSEXITS
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/stand/unix"
+#define FSCALE          256
+
+#define HAVE_SYS_STATVFS_H
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-Unixware7 b/OS/unsupported/os.h-Unixware7
new file mode 100644
index 0000000..4d3ed42
--- /dev/null
+++ b/OS/unsupported/os.h-Unixware7
@@ -0,0 +1,18 @@
+/* Exim: OS-specific C header file for Unixware 7 */
+
+#define NO_SYSEXITS
+
+#define EXIM_SOCKLEN_T size_t
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   short
+#define LOAD_AVG_SYMBOL "avenrun"
+#define KERNEL_PATH     "/stand/unix"
+#define FSCALE          256
+
+#define HAVE_SYS_STATVFS_H
+#define _SVID3
+#define NEED_H_ERRNO
+
+/* End */
diff --git a/OS/unsupported/os.h-cygwin b/OS/unsupported/os.h-cygwin
new file mode 100644
index 0000000..6ef59e0
--- /dev/null
+++ b/OS/unsupported/os.h-cygwin
@@ -0,0 +1,41 @@
+/* Exim: OS-specific C header file for Cygwin */
+
+/* This code was supplied by Pierre A. Humblet <Pierre.Humblet@ieee.org>
+   December 2002. Updated Jan 2015. */
+
+/* Redefine the set*id calls to run when faking root */
+#include <unistd.h>   /* Do not redefine in unitsd.h */
+int cygwin_setuid(uid_t uid );
+int cygwin_setgid(gid_t gid );
+#define setuid cygwin_setuid
+#define setgid cygwin_setgid
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+#define BASE_62 36  /* Windows aliases lower and upper cases in filenames.
+                       Consider reducing MAX_LOCALHOST_NUMBER */
+#define CRYPT_H
+#define HAVE_MMAP
+#define HAVE_SYS_VFS_H
+#define NO_IP_VAR_H
+#define NO_IP_OPTIONS
+/* Defining LOAD_AVG_NEEDS_ROOT causes an initial
+   call to os_getloadavg. In our case this is beneficial
+   because it initializes the counts */
+#define LOAD_AVG_NEEDS_ROOT
+
+typedef struct flock flock_t;
+
+/* Macro to define variable length SID structures */
+#define SID(n, name, sid...) \
+struct  { \
+  BYTE  Revision; \
+  BYTE  SubAuthorityCount; \
+  SID_IDENTIFIER_AUTHORITY IdentifierAuthority; \
+  DWORD SubAuthority[n]; \
+} name = { SID_REVISION, n, {SECURITY_NT_AUTHORITY}, {sid}}
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */
diff --git a/OS/unsupported/os.h-mips b/OS/unsupported/os.h-mips
new file mode 100644
index 0000000..325e3a1
--- /dev/null
+++ b/OS/unsupported/os.h-mips
@@ -0,0 +1,27 @@
+/* Exim: OS-specific C header file for RiscOS4bsd */
+
+#define LOAD_AVG_NEEDS_ROOT
+#define HAVE_DEV_KMEM
+#define LOAD_AVG_TYPE   long
+#define LOAD_AVG_SYMBOL "_avenrun"
+#define KERNEL_PATH     "/unix"
+
+#define HAVE_MMAP
+#define HAVE_SYS_VFS_H
+
+#define F_FREESP     O_TRUNC
+#define EXIT_FAILURE 1
+#define EXIT_SUCCESS 0
+typedef struct flock flock_t;
+
+#define STRERROR_FROM_ERRLIST
+#define memmove(a, b, c) bcopy(b, a, c)
+
+extern char *strerror(int);
+extern int   sys_nerr;
+extern char *sys_errlist[];
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */