From 81297f0fa1a0f021c5dfe120d0f4419d5cbcb2b5 Mon Sep 17 00:00:00 2001
From: George Marques <george@gmarqu.es>
Date: Thu, 5 May 2016 14:10:41 -0300
Subject: [PATCH] Fix build for Windows 64-bits with GCC

---
 drivers/gl_context/glew.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gl_context/glew.h b/drivers/gl_context/glew.h
index 7b66ea97edf..39c8162dead 100644
--- a/drivers/gl_context/glew.h
+++ b/drivers/gl_context/glew.h
@@ -153,7 +153,11 @@ typedef unsigned short wchar_t;
 #endif
 #if !defined(_PTRDIFF_T_DEFINED) && !defined(_PTRDIFF_T_)
 #  ifdef _WIN64
+#    ifdef _MSC_VER // Using MSVC
 typedef __int64 ptrdiff_t;
+#    else // Using GCC
+typedef long int ptrdiff_t;
+#    endif
 #  else
 typedef _W64 int ptrdiff_t;
 #  endif