Add a maintainer-clean rule

rules/build-package.mk

@@ -52,6 +52,8 @@ $(call clean-target,$1,$2,$1/$2)
 
 distclean : clean_$1_$2_config
 
+maintainer-clean : distclean
+
 .PHONY: clean_$1_$2_config
 clean_$1_$2_config:
 	$(RM) $1/config.log $1/config.status $1/include/Hs*Config.h