$NetBSD: patch-aq,v 1.1 1999/01/10 23:52:16 tron Exp $

--- pnm/pnmmerge.c.orig	Mon Jan 31 12:31:47 1994
+++ pnm/pnmmerge.c	Sun Jan 10 23:48:40 1999
@@ -30,6 +30,10 @@
 	{
 	++argv;
 	--argc;
+	if(!*argv)	{
+		fprintf(stderr, "Usage: pnmmerge pnm_program_name [args ...]\n");
+		exit(1);
+		}
 	goto again;
 	}
 
@@ -51,6 +55,7 @@
     TRY("pnmgamma", pnmgamma_main);
     TRY("pnminvert", pnminvert_main);
     TRY("pnmhistmap", pnmhistmap_main);
+    TRY("pnmhisteq", pnmhisteq_main);
     TRY("pnmnlfilt", pnmnlfilt_main);
     TRY("pnmnoraw", pnmnoraw_main);
     TRY("pnmpaste", pnmpaste_main);
@@ -76,6 +81,7 @@
 #endif /*LIBTIFF*/
     TRY("xwdtopnm", xwdtopnm_main);
     TRY("zeisstopnm", zeisstopnm_main);
+    TRY("pnmsmooth", pnmsmooth_main);
 
     (void) fprintf(
 	stderr, "pnmmerge: \"%s\" is an unknown PNM program!\n", cp );