(autoconf-mode): Fix comment-start-skip.

diff --git a/lisp/progmodes/autoconf.el b/lisp/progmodes/autoconf.el
index 69bf7aab775895a2c1e3387eaec51534e9026320..51e23980ff8e16ee8b04e2bbca2d2a2e34d948e2 100644 (file)
--- 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)