From e81ca57a7bae30191ab7d3daf60e1b087d0bd2b7 Mon Sep 17 00:00:00 2001
From: Y7n05h <Y7n05h@protonmail.com>
Date: Sun, 3 Apr 2022 15:43:25 +0800
Subject: [PATCH] Add conditional compilation

Signed-off-by: Y7n05h <Y7n05h@protonmail.com>
---
 pdns/dnsdist.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pdns/dnsdist.cc b/pdns/dnsdist.cc
index bf98eb1286..5ac0cccf6d 100644
--- a/pdns/dnsdist.cc
+++ b/pdns/dnsdist.cc
@@ -1983,11 +1983,13 @@ static void setUpLocalBind(std::unique_ptr<ClientState>& cs)
     if (cs->fastOpenQueueSize > 0) {
 #ifdef TCP_FASTOPEN
       SSetsockopt(fd, IPPROTO_TCP, TCP_FASTOPEN, cs->fastOpenQueueSize);
+#ifdef TCP_FASTOPEN_KEY
       if (!g_TCPFastOpenKey.empty()) {
         auto res = setsockopt(fd, IPPROTO_IP, TCP_FASTOPEN_KEY, g_TCPFastOpenKey.data(), g_TCPFastOpenKey.size() * sizeof(g_TCPFastOpenKey[0]));
         if (res == -1)
           throw runtime_error("setsockopt for level IPPROTO_TCP and opname TCP_FASTOPEN_KEY failed: " + stringerror());
       }
+#endif
 #else
       if (warn) {
         warnlog("TCP Fast Open has been configured on local address '%s' but is not supported", cs->local.toStringWithPort());
-- 
2.47.2