From 5c564dfd4e82d41153ea552de5fa2474845c27f4 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 8 Jul 2020 11:57:55 -0700
Subject: [PATCH] tools/m4: Add RB_VAR_PREPEND macro supplement for
 AS_VAR_PREPEND.

---
 tools/m4/ratbox.m4 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/m4/ratbox.m4 b/tools/m4/ratbox.m4
index 2977f4efa..082efc760 100644
--- a/tools/m4/ratbox.m4
+++ b/tools/m4/ratbox.m4
@@ -28,3 +28,5 @@ AC_DEFUN([CPPDEFINE],
 ])
 
 AC_DEFUN([RB_HELP_STRING], [AS_HELP_STRING([$1], [$2], 40, 200)])
+
+AC_DEFUN([RB_VAR_PREPEND], [AS_VAR_SET([$1], ["$2 ${$1}"])])