$NetBSD: patch-bf,v 1.2 1998/08/07 10:40:50 agc Exp $

--- ./pgm/pgmmerge.c.orig	Fri Jan 28 05:17:38 1994
+++ ./pgm/pgmmerge.c	Sat Aug 12 23:51:14 1995
@@ -29,6 +29,10 @@
 	{
 	++argv;
 	--argc;
+	if(!*argv)	{
+		fprintf(stderr, "Usage: pgmmerge pgm_program_name [args ...]\n");
+		exit(1);
+		}
 	goto again;
 	}