diff -r 6e5312167b4a distutils2/dist.py
--- a/distutils2/dist.py	Sat Apr 21 10:30:23 2012 -0400
+++ b/distutils2/dist.py	Tue Apr 24 01:10:21 2012 +0900
@@ -700,7 +700,7 @@
             return
 
         if options is not None:
-            self.command_options[command] = options
+            self.get_option_dict(command).update(options)
 
         cmd_obj = self.get_command_obj(command)
         cmd_obj.ensure_finalized()