From 0880d7cd0fe9641d65f42100d6012f46c3878759 Mon Sep 17 00:00:00 2001
From: Camden Narzt <c.narzt@me.com>
Date: Wed, 9 Dec 2020 16:15:40 -0700
Subject: [PATCH] fix compilation on macOS Big Sur

You must define `__APPLE_USE_RFC_3542` in order to use the `IPV6_DONTFRAG` sockopt: https://opensource.apple.com/source/xnu/xnu-6153.141.1/bsd/netinet6/in6.h.auto.html
```
 * To use the new IPv6 Sockets options introduced by RFC 3542
 * the constant __APPLE_USE_RFC_3542 must be defined before
 * including <netinet/in.h>
```
---
 src/ns_turn_defs.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ns_turn_defs.h b/src/ns_turn_defs.h
index 336e0485..461ceccd 100644
--- a/src/ns_turn_defs.h
+++ b/src/ns_turn_defs.h
@@ -39,6 +39,10 @@
 #include <sys/param.h>
 #endif
 
+#if defined(__APPLE__) || defined(__DARWIN__) || defined(__MACH__)
+#define __APPLE_USE_RFC_3542
+#endif
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>