--- a/stage4/Makefile	Wed Jul 06 12:19:30 2011 +0200
+++ b/stage4/Makefile	Thu Jul 07 10:49:08 2011 +0200
@@ -28,7 +28,7 @@
 
 clean:
 	rm -f *.o
-	find . -depth -mindepth 2 -maxdepth 2 -name Makefile | sed 's/Makefile//g' | xargs -I {} make -C{} clean
+	find . -depth -mindepth 2 -maxdepth 2 -name Makefile | sed 's/Makefile//g' | xargs -I {} $(MAKE) -C{} clean
 
 
 CXXFLAGS += -I. -I../*