From 1e3642b1824af1f8e5bb4a335601ff69b5f034b3 Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Tue, 20 Oct 2020 08:29:03 +0200
Subject: [PATCH] Fix cluster -? to actually print usage instead of error on
 macOS

Towards https://gitlab.com/graphviz/graphviz/-/issues/1852.
---
 cmd/gvmap/cluster.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmd/gvmap/cluster.c b/cmd/gvmap/cluster.c
index e5232bac9..a7fcdf7c9 100644
--- a/cmd/gvmap/cluster.c
+++ b/cmd/gvmap/cluster.c
@@ -120,7 +120,7 @@ static void init(int argc, char *argv[], opts_t* opts) {
       Verbose = 1;
       break;
     case '?':
-      if (optopt == '\0')
+      if (optopt == '\0' || optopt == '?')
 	usage(cmd, 0);
       else {
 	fprintf(stderr, " option -%c unrecognized\n",
-- 
2.40.0