From 379e97cc1c0ac8539722a60a74986051de370f50 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Mon, 6 Nov 2017 15:02:50 -0500
Subject: [PATCH] Set _WIN32_WINNT to 0x501 for MinGW and <wspiapi.h> (GH #529)

---
 socketft.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/socketft.cpp b/socketft.cpp
index 454eaa57..20cda226 100644
--- a/socketft.cpp
+++ b/socketft.cpp
@@ -30,6 +30,14 @@
 # include <sanitizer/msan_interface.h>
 #endif
 
+// From http://groups.google.com/d/msg/cryptopp-users/MzvocLrbIpE/TMCa6LFhCgAJ,
+// <wspiapi.h> is a compatibility header and it needs _WIN32_WINNT >= 0x501.
+// The work-around should be OK since it won't cross-pollinate into header files.
+#if defined(__MINGW32__) && (_WIN32_WINNT < 0x501)
+# undef _WIN32_WINNT
+# define _WIN32_WINNT 0x501
+#endif
+
 #ifdef USE_WINDOWS_STYLE_SOCKETS
 # pragma comment(lib, "ws2_32.lib")
 # if defined(_WIN32_WINNT) && (_WIN32_WINNT < 0x501)