From 73ae67006c952b8804f2566e868bc3acf7539857 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 7 Feb 2017 11:39:49 -0500
Subject: curl: Fix passing _WINSOCKAPI_ macro to compiler

Define `_WINSOCKAPI_` blank rather than to 1 in order to match the
value used by Microsoft's winsock header files.

Backported from upstream curl commit 192466e0 (cmake: Fix passing
_WINSOCKAPI_ macro to compiler, 2017-01-09).

Fixes: #16545
---
 Utilities/cmcurl/CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Utilities/cmcurl/CMakeLists.txt b/Utilities/cmcurl/CMakeLists.txt
index 5cef59f..6a34e8d 100644
--- a/Utilities/cmcurl/CMakeLists.txt
+++ b/Utilities/cmcurl/CMakeLists.txt
@@ -316,7 +316,7 @@ include (CheckCSourceCompiles)
 
 # On windows preload settings
 if(WIN32)
-  set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} -D_WINSOCKAPI_")
+  set(CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} -D_WINSOCKAPI_=")
   include(${CMAKE_CURRENT_SOURCE_DIR}/CMake/Platforms/WindowsCache.cmake)
 endif(WIN32)
 
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