Evermake: aself-regenerating portable makefile that makes itself when new sources are added in order to include them, no coding required

Makefile

LD	= gcc
SHELL	= /bin/sh
mainx : Makefile
	$(LD) -o mainx *.o

clean ::
	-$(RM) mainx

Makefile : *.c
	@sed -e '/^### Do Not edit this line$$/,$$d' Makefile \
		> MMM.$$$$ && mv MMM.$$$$ Makefile
	@echo "### Do Not edit this line" >> Makefile
	@echo "### Everything below is auto-generated" >> Makefile
	@for f in *.c ; do echo ===$$f=== 1>&2 ; ff=`basename $$f .c`.o ; \
	gcc -MM $$f ; echo ""; echo "mainx : $$ff" ; echo "$$ff : $$f" ; \
	echo '	$$(CC) $$(CFLAGS) -c '"$$f" ; echo "" ; echo "clean ::" ; \
	echo '	-$$(RM) '"$$ff" ; echo "" ; done >> Makefile
	@$(MAKE)