Rename __standalone_mode__ to STANDALONE_MODE The fix for [1] prevents from importing python variables __foo__, as explained in [2]. Rename standalone mode flag correspondingly. [1] https://github.com/facebook/buck/issues/182 [2] https://github.com/facebook/buck/issues/221 Change-Id: I0ac05c80a1d5fc1b8f8bd2c5ca5dabdfeeecbe52