From 9903a5539d0c3ec2a4e4e7ced1da7be24867d4d7 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Thu, 5 Jul 2012 15:46:18 +0000
Subject: [PATCH] Restrict gcc pragma to gcc-4.0 and later.

[SVN r79286]
---
 include/boost/type_traits/is_virtual_base_of.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/type_traits/is_virtual_base_of.hpp b/include/boost/type_traits/is_virtual_base_of.hpp
index ffb021e..f57cb61 100644
--- a/include/boost/type_traits/is_virtual_base_of.hpp
+++ b/include/boost/type_traits/is_virtual_base_of.hpp
@@ -23,7 +23,7 @@ namespace detail {
 #ifdef BOOST_MSVC
 #pragma warning( push )
 #pragma warning( disable : 4584 4250)
-#elif defined __GNUC__
+#elif defined(__GNUC__) && (__GNUC__ >= 4)
 #pragma GCC system_header
 #endif