$OpenBSD: patch-history_c,v 1.3 2003/05/15 03:25:56 markus Exp $
--- history.c.orig	Wed Nov 20 21:43:31 2002
+++ history.c	Wed Nov 20 21:43:52 2002
@@ -331,7 +331,7 @@ next:	s = getcommand();
 			fprintf(stderr, "%s\n", s);
 		if (shell == NULL)
 			shell = "/bin/sh";
-		execl(shell, rc_basename(shell), "-c", s, NULL);
+		execl(shell, rc_basename(shell), "-c", s, (void *)NULL);
 		perror(shell);
 		exit(1);
 	}