$OpenBSD: patch-filter_c,v 1.2 2005/02/07 17:16:16 naddy Exp $
--- filter.c.orig	Wed Feb  2 15:55:59 2005
+++ filter.c	Wed Feb  2 15:56:10 2005
@@ -113,7 +113,7 @@ mutt_create_filter_fd (const char *cmd, 
       close (fderr);
     }
 
-    execl (EXECSHELL, "sh", "-c", cmd, NULL);
+    execl (EXECSHELL, "sh", "-c", cmd, (void *)NULL);
     _exit (127);
   }
   else if (thepid == -1)
