From be8d29f50a9d0d6c1fb94626b32b9db1c320c514 Mon Sep 17 00:00:00 2001
From: abv <abv@opencascade.com>
Date: Thu, 13 Mar 2014 09:15:46 +0400
Subject: [PATCH] 0024718: Broken build on VC8 (VS 2005) if TBB is used

Macro _WIN32_WINNT defined in OpenGl_SceneGeometry.cxx for building with TBB on VS 2005
---
 src/OpenGl/OpenGl_SceneGeometry.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/OpenGl/OpenGl_SceneGeometry.cxx b/src/OpenGl/OpenGl_SceneGeometry.cxx
index aca6a47438..05f83ca43e 100755
--- a/src/OpenGl/OpenGl_SceneGeometry.cxx
+++ b/src/OpenGl/OpenGl_SceneGeometry.cxx
@@ -22,6 +22,14 @@
 #include <Standard_Assert.hxx>
 
 #ifdef HAVE_TBB
+  // On Windows, function TryEnterCriticalSection has appeared in Windows NT
+  // and is surrounded by #ifdef in MS VC++ 7.1 headers.
+  // Thus to use it we need to define appropriate macro saying that we wil
+  // run on Windows NT 4.0 at least
+  #if ((defined(_WIN32) || defined(__WIN32__)) && !defined(_WIN32_WINNT))
+    #define _WIN32_WINNT 0x0501
+  #endif
+
   #include <tbb/tbb.h>
 #endif