MAKEFILES = $(wildcard */Makefile)
SUBDIRS = $(MAKEFILES:%/Makefile=%)

all: build check

build: $(SUBDIRS:%=build-%)

check: $(SUBDIRS:%=check-%)

build-%:
	$(MAKE) -C $*

check-%:
	! grep ^test: $*/Makefile || $(MAKE) -C $* test
	! grep ^check: $*/Makefile || $(MAKE) -C $* check