From 504baa66c1cce12ac34e1014e03a8126a5bb5e86 Mon Sep 17 00:00:00 2001
From: ser1zw <azariahsawtikes@gmail.com>
Date: Mon, 25 Mar 2013 02:32:41 +0900
Subject: [PATCH] fix for mswin32

---
 ext/opencv/extconf.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ext/opencv/extconf.rb b/ext/opencv/extconf.rb
index 5a3843a..576b4c7 100755
--- a/ext/opencv/extconf.rb
+++ b/ext/opencv/extconf.rb
@@ -70,8 +70,10 @@ opencv_headers.each {|header|
 }
 have_header("stdarg.h")
 
-$warnflags.slice!('-Wdeclaration-after-statement')
-$warnflags.slice!('-Wimplicit-function-declaration')
+if $warnflags
+  $warnflags.slice!('-Wdeclaration-after-statement')
+  $warnflags.slice!('-Wimplicit-function-declaration')
+end
 
 # Quick fix for 1.8.7
 $CFLAGS << " -I#{File.dirname(__FILE__)}/ext/opencv"