MKSUBDIR = \
	set -e;							\
	targ=$@; targ=$${targ\#d};				\
	for i in $$dirs; do					\
		export BASE=$(BASE)$$i/;			\
		if [ ! -d $$i ]; then				\
			echo Skipping nonexistent directory: $$i 1>&2;	\
		else						\
			echo MAKE $$targ $$BASE;		\
			(cd $$i && $(MAKE) $$targ) || exit $?;	\
		fi;						\
	done

dall:
	+dirs="$(DIRS)"; $(MKSUBDIR)
dclean:
	+dirs="$(DIRS)"; $(MKSUBDIR)
dinstall:
	+dirs="$(INSTDIRS)"; $(MKSUBDIR)
duninstall:
	+dirs="$(INSTDIRS)"; $(MKSUBDIR)
ddepend:
	+dirs="$(DIRS)"; $(MKSUBDIR)

all: dall
clean: dclean
install: dinstall
uninstall: duninstall
depend: ddepend

INSTDIRS = $(DIRS)