From e602dda02fc9affbdd846018ae8b05ce012e12e5 Mon Sep 17 00:00:00 2001
From: Kohei Suzuki <eagletmt@gmail.com>
Date: Sat, 14 Sep 2013 14:12:48 +0900
Subject: [PATCH] Honor RbConfig::MAKEFILE_CONFIG['CFLAGS']

---
 ext/byebug/extconf.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext/byebug/extconf.rb b/ext/byebug/extconf.rb
index 9464a7409..ac7cb2421 100644
--- a/ext/byebug/extconf.rb
+++ b/ext/byebug/extconf.rb
@@ -8,7 +8,8 @@
 end
 
 if RbConfig::MAKEFILE_CONFIG['CC'] =~ /gcc/
-  $CFLAGS = '-Wall -Werror'
+  $CFLAGS ||= ''
+  $CFLAGS += ' -Wall -Werror'
   $CFLAGS += ' -gdwarf-2 -g3' if ENV['debug']
 end