diff --git a/lib/resource/Makefile b/lib/resource/Makefile
index 14023dcc2..13d8a394a 100644
--- a/lib/resource/Makefile
+++ b/lib/resource/Makefile
@@ -1,2 +1,4 @@
 all:
-	gf  -src +RTS -K10M <MkResource.gfs
+	gf +RTS -K10M <MkResource.gfs
+clean:
+	rm -f */*.gfc */*.gfr