From 1ea55acf8aaa1a59b4453e4aec1fc704d7696321 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 9 Feb 2016 13:20:39 -0500
Subject: cmCurl: Fix compilation with system curl versions prior to 7.21.5

This version introduced CURLE_NOT_BUILT_IN which we have used since
commit v3.4.0-rc1~211^2~4 (cmCurl: Tolerate lack of CURLOPT_CAPATH
support, 2015-08-12).  For older versions, just define the name to the
then-unused error code so that we can compile.
---
 Source/cmCurl.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Source/cmCurl.cxx b/Source/cmCurl.cxx
index ad0c7d3..4f3d890 100644
--- a/Source/cmCurl.cxx
+++ b/Source/cmCurl.cxx
@@ -12,6 +12,11 @@
 #include "cmCurl.h"
 #include "cmSystemTools.h"
 
+// curl versions before 7.21.5 did not provide this error code
+#if defined(LIBCURL_VERSION_NUM) && LIBCURL_VERSION_NUM < 0x071505
+# define CURLE_NOT_BUILT_IN 4
+#endif
+
 #define check_curl_result(result, errstr)                               \
   if (result != CURLE_OK && result != CURLE_NOT_BUILT_IN)               \
     {                                                                   \
-- 
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