$OpenBSD: patch-mutt_tunnel_c,v 1.5 2007/06/21 17:26:29 bernd Exp $
--- mutt_tunnel.c.orig	Sun Apr  1 23:58:56 2007
+++ mutt_tunnel.c	Sat Apr  7 11:40:27 2007
@@ -97,7 +97,7 @@ static int tunnel_socket_open (CONNECTION *conn)
     /* 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);
