diff -r 62e47da66002 -r ad8cc19e4aec make-rules/prep.mk
--- a/make-rules/prep.mk	Thu Aug 20 14:26:17 2015 -0700
+++ b/make-rules/prep.mk	Wed Aug 19 10:12:59 2015 +0200
@@ -43,6 +43,7 @@
 prep::	$(SOURCE_DIR)/.prep
 
 clean::
+	$(PRE_CLEAN_ACTION)
 	$(RM) -r $(CLEAN_PATHS)
 
 clobber::	clean