#https://www.gnu.org/software/make/manual/make.html#Automatic-Prerequisites


%.d: %.c
	@set -e; rm -f $@; \
	$(CC) -M $(CFLAGS) $< > $@.$$$$; \
	sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
	rm -f $@.$$$$
	
%.o : %.c
	$(CC) -c $(CFLAGS) $< -o $@