diff --git a/lib/Makefile b/lib/Makefile
index 07a149a3..dcbab0a4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,7 +1,14 @@
 SUBDIRS := $(wildcard */.)
+SUBDIRSCLEAN=$(addsuffix clean,$(SUBDIRS))
 
 all: $(SUBDIRS)
+
 $(SUBDIRS):
 	$(MAKE) -C $@
 
-.PHONY: all $(SUBDIRS)
+clean: 
+	for dir in $(SUBDIRS); do \
+		$(MAKE) -C $$dir $@; \
+	done
+
+.PHONY: all $(SUBDIRS) $(SUBDIRSCLEAN)