diff --git a/distrib/Makefile-bin-vars.in b/distrib/Makefile-bin-vars.in
index 1b5b8fa71f5ee9451c01efb66714abf62ebf18ea..511f237b24cbc1cbba8f26f5f31d46f7ff40065d 100644
--- a/distrib/Makefile-bin-vars.in
+++ b/distrib/Makefile-bin-vars.in
@@ -41,6 +41,7 @@ exeext      = @exeext@
 SED	        = @SedCmd@
 DEFAULT_TMPDIR = /tmp
 RANLIB      = @RANLIB@
+CPP         = @CPP@
 
 RAWCPP_FLAGS            = -undef -traditional