--- xrp.c.orig	Wed Jul 10 08:47:30 1996
+++ xrp.c	Wed Mar 18 14:49:59 1998
@@ -124,7 +124,19 @@
 
 main(int argc, char **argv)
 {  
+  int ch;
+  extern char *__progname;
   waterh=64;
+  while ((ch = getopt(argc, argv, "h:")) != -1)
+	switch (ch) {
+	case 'h':
+		waterh = atoi(optarg);
+		break;
+	default:
+		fprintf(stderr, "usage: %s [-h <height>]\n", __progname);
+		exit(1);
+		break;
+	}
   OpenWindow(waterh);
   doit();
 }