From ccad27551fe14c2c3e2de19d57c1e6b49e9a8587 Mon Sep 17 00:00:00 2001
From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Wed, 31 Oct 2001 02:33:29 +0000
Subject: [PATCH] (autoconf-mode): Fix comment-start-skip.

---
 lisp/progmodes/autoconf.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/progmodes/autoconf.el b/lisp/progmodes/autoconf.el
index 69bf7aab775..51e23980ff8 100644
--- a/lisp/progmodes/autoconf.el
+++ b/lisp/progmodes/autoconf.el
@@ -4,7 +4,7 @@
 
 ;; Author: Dave Love <fx@gnu.org>
 ;; Keywords: languages
-;; $Revision: 1.1 $
+;; $Revision: 1.2 $
 
 ;; This file is part of GNU Emacs.
 
@@ -93,7 +93,7 @@ searching backwards at another AC_... command."
   (set (make-local-variable 'defun-prompt-regexp)
        "^[ \t]*A[CM]_\\(\\sw\\|\\s_\\)+")
   (set (make-local-variable 'comment-start) "dnl ")
-  (set (make-local-variable 'comment-start-skip) "\\(\\<dnl\\|#\\) +")
+  (set (make-local-variable 'comment-start-skip) "\\(?:\\<dnl\\|#\\) +")
   (set (make-local-variable 'font-lock-syntactic-keywords)
        autoconf-font-lock-syntactic-keywords)
   (set (make-local-variable 'font-lock-defaults)
-- 
2.39.2