$OpenBSD: patch-mutt_tunnel_c,v 1.4 2006/08/02 14:30:09 bernd Exp $
--- mutt_tunnel.c.orig	Tue Dec 20 10:36:02 2005
+++ mutt_tunnel.c	Sat Jul 15 11:06:15 2006
@@ -97,7 +97,7 @@ static int tunnel_socket_open (CONNECTIO
     /* Don't let the subprocess think it can use the controlling tty */
     setsid ();
 
-    execl (EXECSHELL, "sh", "-c", Tunnel, NULL);
+    execl (EXECSHELL, "sh", "-c", Tunnel, (void *)NULL);
     _exit (127);
   }
   mutt_unblock_signals_system (1);
