Adding upstream version 4.92.upstream/4.92upstream

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

71 files changed, 2582 insertions, 0 deletions

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( |$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-CYGWIN b/OS/unsupported/Makefile-CYGWIN
new file mode 100644
index 0000000..006e9fe
--- /dev/null
+++ b/OS/unsupported/Makefile-CYGWIN
@@ -0,0 +1,113 @@
+# OS-specific file for Cygwin.
+
+# This file provided by Pierre A. Humblet <Pierre.Humblet@ieee.org>
+
+HAVE_IPV6 = yes
+HAVE_ICONV = yes
+# Use c99 to have %z 
+CFLAGS= -g -Wall -std=c99 -U __STRICT_ANSI__
+LIBS= -lcrypt -lresolv
+LIBS_EXIM= -liconv
+EXIWHAT_PS_ARG=-as
+EXIWHAT_KILL_SIGNAL=-USR1
+EXIWHAT_EGREP_ARG='/(EXIM|exim)[0-9. -]*$$'
+
+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
+
+SUPPORT_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-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]+$$)'
+EXIWHAT_KILL_SIGNAL=-USR1
+
+# End
diff --git a/OS/unsupported/Makefile-GNU b/OS/unsupported/Makefile-GNU
new file mode 100644
index 0000000..e464341
--- /dev/null
+++ b/OS/unsupported/Makefile-GNU
@@ -0,0 +1,29 @@
+# Exim: OS-specific make file for GNU and variants.
+
+HAVE_ICONV=yes
+
+BASENAME_COMMAND=look_for_it
+CHOWN_COMMAND=look_for_it
+CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
+
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+
+DBMLIB = -ldb
+USE_DB = yes
+
+LIBS = -lnsl -lcrypt -lm
+LIBRESOLV = -lresolv
+
+X11=/usr/X11R6
+XINCLUDE=-I$(X11)/include
+XLFLAGS=-L$(X11)/lib
+X11_LD_LIB=$(X11)/lib
+
+EXIWHAT_PS_ARG=ax
+EXIWHAT_EGREP_ARG='/exim( |$$)'
+EXIWHAT_MULTIKILL_CMD=killall
+EXIWHAT_MULTIKILL_ARG=exim
+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-GNU b/OS/unsupported/os.c-GNU
new file mode 100644
index 0000000..e5d6ff6
--- /dev/null
+++ b/OS/unsupported/os.c-GNU
@@ -0,0 +1,55 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* 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/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..1f6b0e1
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX
@@ -0,0 +1,118 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* 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);
+
+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..1f6b0e1
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX6
@@ -0,0 +1,118 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* 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);
+
+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..1f6b0e1
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX632
@@ -0,0 +1,118 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* 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);
+
+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..1f6b0e1
--- /dev/null
+++ b/OS/unsupported/os.c-IRIX65
@@ -0,0 +1,118 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* 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);
+
+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..c9464aa
--- /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 = malloc(size)) != NULL)
+         && (cygwin_conv_path(CCP_POSIX_TO_WIN_W,"/", win32_path, size) == 0)) {
+	        fprintf(stderr, " Root / mapped to %ls.\n", win32_path);
+		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-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-GNU b/OS/unsupported/os.h-GNU
new file mode 100644
index 0000000..4499316
--- /dev/null
+++ b/OS/unsupported/os.h-GNU
@@ -0,0 +1,23 @@
+/* Exim: OS-specific C header file for GNU/Hurd */
+
+#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 **
+
+/* 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..d2d3e0d
--- /dev/null
+++ b/OS/unsupported/os.h-NetBSD
@@ -0,0 +1,28 @@
+/* Exim: OS-specific C header file for NetBSD */
+
+#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 **
+
+/* 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 */