$OpenBSD: patch-system_c,v 1.4 2007/06/21 17:26:29 bernd Exp $
--- system.c.orig	Sun Apr  1 23:58:58 2007
+++ system.c	Sat Apr  7 11:40:27 2007
@@ -114,7 +114,7 @@ int _mutt_system (const char *cmd, int flags)
     sigaction (SIGTSTP, &act, NULL);
     sigaction (SIGCONT, &act, NULL);
 
-    execl (EXECSHELL, "sh", "-c", cmd, NULL);
+    execl (EXECSHELL, "sh", "-c", cmd, (void *)NULL);
     _exit (127); /* execl error */
   }
   else if (thepid != -1)
