ifdef SUBDIRS

all.dirs:
	for dir in $(SUBDIRS); do make -C $$dir all; done
install.dirs:
	for dir in $(SUBDIRS); do make -C $$dir install; done
clean.dirs:
	for dir in $(SUBDIRS); do make -C $$dir clean; done
distclean.dirs:
	for dir in $(SUBDIRS); do make -C $$dir distclean; done

all: all.dirs
install: install.dirs
clean: clean.dirs
distclean: distclean.dirs

else

all.dirs:
install.dirs:
clean.dirs:
distclean.dirs:

endif