From b2b3b79d689a58c471811fc4fcad0e82adbfc21c Mon Sep 17 00:00:00 2001
From: Otto <otto.moerbeek@open-xchange.com>
Date: Fri, 5 Mar 2021 13:36:28 +0100
Subject: [PATCH] make CURLOPT_TCP_FASTOPEN conditional on availability

---
 pdns/minicurl.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pdns/minicurl.cc b/pdns/minicurl.cc
index fff3636ff3..b38413d47a 100644
--- a/pdns/minicurl.cc
+++ b/pdns/minicurl.cc
@@ -112,8 +112,11 @@ void MiniCurl::setupURL(const std::string& str, const ComboAddress* rem, const C
   curl_easy_setopt(d_curl, CURLOPT_WRITEFUNCTION, write_callback);
   curl_easy_setopt(d_curl, CURLOPT_WRITEDATA, this);
   curl_easy_setopt(d_curl, CURLOPT_TIMEOUT, static_cast<long>(timeout));
+#if defined(CURL_AT_LEAST_VERSION)
+#if CURL_AT_LEAST_VERSION(7, 49, 0) && defined(__linux__)
   curl_easy_setopt(d_curl, CURLOPT_TCP_FASTOPEN, fastopen);
-
+#endif
+#endif
   clearHeaders();
   d_data.clear();
 }
-- 
2.47.2