From 356e7b3a69dcfdad8f8d09ce921c11e0566cb99c Mon Sep 17 00:00:00 2001
From: David Schweikert <david@schweikert.ch>
Date: Tue, 10 Jan 2017 15:52:58 +0100
Subject: [PATCH] fix compatibility issue with MacOS in release 3.14 (fixes
 #109)

---
 src/fping.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/fping.c b/src/fping.c
index fd424eb..b02493c 100644
--- a/src/fping.c
+++ b/src/fping.c
@@ -387,12 +387,17 @@ int main( int argc, char **argv )
         switch( c )
         {
         case 'M':
+#ifdef IP_MTU_DISCOVER
             {
-            int val = IP_PMTUDISC_DO;
-            if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val))) {
-                perror("setsockopt IP_MTU_DISCOVER");
-            }
+                int val = IP_PMTUDISC_DO;
+                if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val))) {
+                    perror("setsockopt IP_MTU_DISCOVER");
+                }
             }
+#else
+            fprintf(stderr, "-M option not supported on this platform\n");
+            exit(1);
+#endif
             break;
 
         case 't':