From 44d20d61c7babae9fd2ac3c6578208efa631d5a3 Mon Sep 17 00:00:00 2001
From: luislavena <luislavena@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 12 Jan 2012 18:28:17 +0000
Subject: Do not define _WIN32_WINNT multiple times

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34284 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/socket/extconf.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'ext/socket/extconf.rb')

diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 2e308fe1ab..7bfc01c35d 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -56,7 +56,7 @@ end
 
 if ipv6
   if $mingw
-    $CPPFLAGS << " -D_WIN32_WINNT=0x501"
+    $CPPFLAGS << " -D_WIN32_WINNT=0x501" unless $CPPFLAGS.include?("_WIN32_WINNT")
   end
   ipv6lib = nil
   class << (fmt = "unknown")
-- 
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