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+# Top-level makefile for Exim; handles creating a build directory with
+# appropriate links, and then creating and running the main makefile in that
+# directory.
+
+# Copyright (c) The Exim Maintainers 2022
+# Copyright (c) University of Cambridge, 1995 - 2018
+# See the file NOTICE for conditions of use and distribution.
+
+# IRIX make uses the shell that is in the SHELL variable, which often defaults
+# to csh, so put this in to make it use the Bourne shell. In systems where
+# /bin/sh is not a Bourne-compatible shell, this line will have to be edited,
+# or "make" must be called with a different SHELL= setting.
+
+SHELL=/bin/sh
+RM_COMMAND=/bin/rm
+
+# The buildname defaults to "<os-type>-<arch-type>". It can be
+# overridden by the "build" parameter when invoking make (e.g. make
+# build=xxx) This does not provide an override for the OS type and
+# architecture type used during the build process; they still have to be
+# used for the OS-specific files. To override them, you can set the
+# shell variables OSTYPE and ARCHTYPE when running make.
+#
+# EXIM_BUILD_SUFFIX gets appended to the buildname.  (This enables
+# parallel builds on a file system shared among different Linux distros
+# (same os-type, same arch-type). The ../test/runtest script honours the
+# EXIM_BUILD_SUFFIX when searching the Exim binary.)
+
+buildname=$${build:-`$(SHELL) scripts/os-type`-`$(SHELL) scripts/arch-type`}$${EXIM_BUILD_SUFFIX:+.$$EXIM_BUILD_SUFFIX}
+
+# The default target checks for the existence of Local/Makefile, that the main
+# makefile is built and up-to-date, and then it runs it.
+# If Local/Makefile-<buildname> exists, it is read too.
+
+all: Local/Makefile configure
+	@cd build-$(buildname); $(MAKE) SHELL=$(SHELL) $(MFLAGS)
+
+# This pair for the convenience of of the Debian maintainers
+exim: Local/Makefile configure
+	@cd build-$(buildname); $(MAKE) SHELL=$(SHELL) $(MFLAGS) exim
+utils: Local/Makefile configure
+	@cd build-$(buildname); $(MAKE) SHELL=$(SHELL) $(MFLAGS) utils
+
+Local/Makefile:
+	@echo ""
+	@echo "*** Please create Local/Makefile by copying src/EDITME and making"
+	@echo "*** appropriate changes for your site."
+	@echo ""
+	@test ! -d Local && mkdir Local
+	@false
+
+# This is separated off so that "make build-directory" can be obeyed on
+# its own if necessary.
+
+build-directory:
+	@builddir=build-$(buildname); \
+	case "$$builddir" in *UnKnown*) exit 1;; esac; \
+	$(SHELL) -c "test -d $$builddir -a -r $$builddir/version.c || \
+	  (mkdir $$builddir; cd $$builddir; $(SHELL) ../scripts/MakeLinks)";
+
+checks:
+	$(SHELL) scripts/source_checks
+
+# The "configure" target ensures that the build directory exists, then arranges
+# to build the main makefile from inside the build directory, by calling the
+# Configure-Makefile script. This does its own dependency checking because of
+# the optional files.
+
+configure: checks build-directory
+	@cd build-$(buildname); \
+	  build=$(build) $(SHELL) ../scripts/Configure-Makefile
+
+# The "makefile" target forces a rebuild of the makefile (as opposed to
+# "configure", which doesn't force it).
+
+makefile: build-directory
+	@cd build-$(buildname); $(RM_COMMAND) -f Makefile; \
+	  build=$(build) $(SHELL) ../scripts/Configure-Makefile
+
+# The installation commands are kept in a separate script, which expects
+# to be run from inside the build directory.
+
+install:        all
+		@cd build-$(buildname); \
+		build=$(build) $(SHELL) ../scripts/exim_install $(INSTALL_ARG)
+
+# Tidy-up targets
+
+clean:; @echo ""; echo '*** "make clean" just removes all .o and .a files'
+	@echo '*** Use "make makefile" to force a rebuild of the makefile'
+	@echo ""
+	cd build-$(buildname); \
+	$(RM_COMMAND) -f *.o lookups/*.o lookups/*.a auths/*.o auths/*.a \
+	routers/*.o routers/*.a transports/*.o transports/*.a \
+	pdkim/*.o pdkim/*.a
+
+clean_exim:; cd build-$(buildname); \
+	 $(RM_COMMAND) -f *.o lookups/*.o lookups/*.a auths/*.o auths/*.a \
+	routers/*.o routers/*.a transports/*.o transports/*.a lookups/*.so
+
+distclean:; $(RM_COMMAND) -rf build-* cscope*
+
+cscope.files: FRC
+	echo "-q" > $@
+	echo "-p3" >> $@
+	-bd=build-$(buildname); [ -d $$bd ] && echo -e "$$bd/config.h\n$$bd/Makefile" >> $@
+	find src Local OS exim_monitor -name "*.[cshyl]" -print \
+		    -o -name "os.[ch]*" -print \
+		    -o -name "*akefile*" -print \
+		    -o -name config.h.defaults -print \
+		    -o -name EDITME -print >> $@
+
+FRC:
+
+# End of top-level makefile