$OpenBSD: patch-filter_c,v 1.1 2002/12/29 09:34:48 pvalchev Exp $
--- filter.c.orig	Sun Dec 29 00:38:57 2002
+++ filter.c	Sun Dec 29 00:39:20 2002
@@ -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)
