SHELL := $(shell which bash)
.ONESHELL:

clean:
	-find -maxdepth 2 -mindepth 2 -name makefile -execdir make $@ \;
	-rm -rfv core.* *~

all:
	find -maxdepth 2 -mindepth 2 -name makefile -execdir make \;

.PHONY: all clean