new file mode 100644
@@ -0,0 +1,14 @@
+SUBDIRS := $(wildcard */.)
+
+.PHONY: all
+all:
+ for dir in $(SUBDIRS); do \
+ ($(MAKE) -C $$dir); \
+ done
+.PHONY: clean
+clean:
+ ($(MAKE) -C $$dir clean); \