From 509f5a59cb717edf3b4ef7fe0fbf6d31f0ed0199 Mon Sep 17 00:00:00 2001
From: "Paul B. Henson" <henson@acm.org>
Date: Sun, 28 Jul 2019 11:55:26 -0700
Subject: [PATCH] Fix -4 option when IPv6 disabled

When IPv6 is disabled, hints_ai_family is set to AF_INET at initialization, resulting in the error "can't specify both -4 and -6" if the -4 option is supplied. If there's no IPv6, make the -4 option a no-op.
---
 src/fping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/fping.c b/src/fping.c
index 9650db9..bd76f32 100644
--- a/src/fping.c
+++ b/src/fping.c
@@ -427,11 +427,13 @@ int main(int argc, char** argv)
     while ((c = optparse_long(&optparse_state, longopts, NULL)) != EOF) {
         switch (c) {
         case '4':
+#ifdef IPV6
             if (hints_ai_family != AF_UNSPEC) {
                 fprintf(stderr, "%s: can't specify both -4 and -6\n", prog);
                 exit(1);
             }
             hints_ai_family = AF_INET;
+#endif
             break;
         case '6':
 #ifdef IPV6