all:
clean: clean.var
distclean: clean.var distclean.var

all install clean distclean test:
ifneq ($(SUBDIRS_TO_ITERATE),)
	set -e; for dir in $(SUBDIRS_TO_ITERATE); do make -C $$dir $@; done
endif

clean.var:
	$(RM) -rf $(CLEAN)
distclean.var:
	$(RM) -rf $(DISTCLEAN)