include Makefile.vars
BUILD_SUBDIRS = $(addprefix build/, $(SUBDIRS))

all: build build/Makefile $(BUILD_SUBDIRS)
	$(MAKE) -C build

$(BUILD_SUBDIRS):
	mkdir $@
build:
	mkdir $@
build/Makefile: ../Makefile.build
	cp $< $@

clean:
	rm -rf build