diff --git a/Formula/bdw-gc.rb b/Formula/bdw-gc.rb
index b8a511bffba..cbb8a11f13d 100644
--- a/Formula/bdw-gc.rb
+++ b/Formula/bdw-gc.rb
@@ -1,9 +1,9 @@
 require 'formula'
 
 class BdwGc <Formula
-  @url='http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc-7.1.tar.gz'
-  @homepage='http://www.hpl.hp.com/personal/Hans_Boehm/gc/'
-  @md5='2ff9924c7249ef7f736ecfe6f08f3f9b'
+  url 'http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/gc-7.1.tar.gz'
+  homepage 'http://www.hpl.hp.com/personal/Hans_Boehm/gc/'
+  md5 '2ff9924c7249ef7f736ecfe6f08f3f9b'
 
   def install
     if MACOS_VERSION == 10.6
@@ -12,7 +12,7 @@ class BdwGc <Formula
       
       # ucontext has been deprecated in 10.6
       # use this flag to force the header to compile
-      ENV['CPPFLAGS'] = ENV['CPPFLAGS'] + " -D_XOPEN_SOURCE"
+      ENV.append 'CPPFLAGS', "-D_XOPEN_SOURCE"
     end
 
     system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"