From 686efe100bcb8acb240d4eb6169a74f5014247ea Mon Sep 17 00:00:00 2001
From: Edward Diener <eldiener@tropicsoft.com>
Date: Wed, 22 Jul 2015 18:23:43 -0400
Subject: [PATCH] Updated Sleep declaration only includes _mingw.h when needed.

---
 include/boost/smart_ptr/detail/yield_k.hpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/boost/smart_ptr/detail/yield_k.hpp b/include/boost/smart_ptr/detail/yield_k.hpp
index 5beefd6..44d1836 100644
--- a/include/boost/smart_ptr/detail/yield_k.hpp
+++ b/include/boost/smart_ptr/detail/yield_k.hpp
@@ -27,10 +27,6 @@
 #include <boost/config.hpp>
 #include <boost/predef.h>
 
-#if defined __MINGW32__
-#include <_mingw.h>
-#endif
-
 #if BOOST_PLAT_WINDOWS_RUNTIME
 #include <thread>
 #endif
@@ -64,12 +60,17 @@ namespace detail
 {
 
 #if !defined( BOOST_USE_WINDOWS_H ) && !BOOST_PLAT_WINDOWS_RUNTIME
-#if !BOOST_COMP_CLANG || (defined __MINGW32__ && !defined __MINGW64_VERSION_MAJOR)
+#if !BOOST_COMP_CLANG || !defined __MINGW32__
+  extern "C" void __stdcall Sleep( unsigned long ms );
+#else
+#include <_mingw.h>
+#if !defined __MINGW64_VERSION_MAJOR
   extern "C" void __stdcall Sleep( unsigned long ms );
 #else
   extern "C" __declspec(dllimport) void __stdcall Sleep( unsigned long ms );
 #endif
 #endif
+#endif
 
 inline void yield( unsigned k )
 {