From d76c4fe77080a924dd870e5c5a370a4e4a30d0d4 Mon Sep 17 00:00:00 2001
From: Benjamin Hipple <bhipple@protonmail.com>
Date: Sat, 9 Dec 2017 20:02:21 -0500
Subject: [PATCH] Fix for builds with system libcurl < 7.30

CentOS 7.4 and RHEL 7.4 ship with libcurl-devel-7.29.0-42.el7.x86_64; this flag
was added in 7.30.0
https://curl.haxx.se/libcurl/c/CURLMOPT_MAX_TOTAL_CONNECTIONS.html
---
 src/libstore/download.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index da31029b4..4474dfd4b 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -369,11 +369,13 @@ struct CurlDownloader : public Downloader
 
         curlm = curl_multi_init();
 
-        #if LIBCURL_VERSION_NUM >= 0x072b00 // correct?
+        #if LIBCURL_VERSION_NUM >= 0x072b00 // Multiplex requires >= 7.43.0
         curl_multi_setopt(curlm, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
         #endif
+        #if LIBCURL_VERSION_NUM >= 0x071e00 // Max connections requires >= 7.30.0
         curl_multi_setopt(curlm, CURLMOPT_MAX_TOTAL_CONNECTIONS,
             settings.binaryCachesParallelConnections.get());
+        #endif
 
         enableHttp2 = settings.enableHttp2;