1 files changed, 1 insertions, 0 deletions
diff --git a/rules.mk b/rules.mk
index f44e8edef4..8844a47a1f 100644
--- a/rules.mk
+++ b/rules.mk
@@ -21,6 +21,7 @@ qstrip=$(strip $(subst ",,$(1)))
 
 empty:=
 space:= $(empty) $(empty)
+comma:=,
 merge=$(subst $(space),,$(1))
 confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
 strip_last=$(patsubst %.$(lastword $(subst .,$(space),$(1))),%,$(1))