X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/412e44aa0e162115d0abab30b74a7e04b351ddf1..668c5d192776326107790e8d622dfa7ddd015ea3:/data/m4sugar/m4sugar.m4

diff --git a/data/m4sugar/m4sugar.m4 b/data/m4sugar/m4sugar.m4
index 3e2f1769..225b7c7a 100644
--- a/data/m4sugar/m4sugar.m4
+++ b/data/m4sugar/m4sugar.m4
@@ -1515,6 +1515,12 @@ m4_define([m4_append],
 [m4_define([$1],
 	   m4_ifdef([$1], [m4_defn([$1])$3])[$2])])
 
+# m4_prepend(MACRO-NAME, STRING, [SEPARATOR])
+# -------------------------------------------
+# Same, but prepend.
+m4_define([m4_prepend],
+[m4_define([$1],
+	   [$2]m4_ifdef([$1], [$3[]m4_defn([$1])]))])
 
 # m4_append_uniq(MACRO-NAME, STRING, [SEPARATOR])
 # -----------------------------------------------