--- setup.py	2012-05-03 23:06:29.000000000 +0200
+++ patch-setup.py	2012-05-06 02:12:06.000000000 +0200
@@ -470,7 +470,7 @@
         xcode4 = True
 
     if xcode4:
-        os.environ['ARCHFLAGS'] = ''
+        pass
 
 setup(name='mercurial',
       version=setupversion,