Powerline: OSX, fermentação: Traceback, ImportError, Símbolo não encontrado: __PyInt_AsInt

Isso está no OS X 10.8.4. Ao tentar usar o powerline no vim com o homebrew python 2.7.5 vinculado, o seguinte traceback resulta:

goldfish:~ goldfish$ brew link python
Linking /usr/local/Cellar/python/2.7.5... 34 symlinks created
goldfish:~ goldfish$ vim
Error detected while processing /Users/goldfish/.vimrc:
line   70:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/goldfish/Library/Python/2.7/lib/python/site-packages/powerline/__init__.py", line 9, in <module>
    from powerline.lib.config import ConfigLoader
  File "/Users/goldfish/Library/Python/2.7/lib/python/site-packages/powerline/lib/config.py", line 3, in <module>
    from powerline.lib.threaded import MultiRunnedThread
  File "/Users/goldfish/Library/Python/2.7/lib/python/site-packages/powerline/lib/threaded.py", line 5, in <module>
    from powerline.lib.monotonic import monotonic
  File "/Users/goldfish/Library/Python/2.7/lib/python/site-packages/powerline/lib/monotonic.py", line 22, in <module>
    import ctypes
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 10, in <module>
    from _ctypes import Union, Structure, Array
ImportError: dlopen(/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so, 2): Symbol not found: __PyInt_AsInt
  Referenced from: /usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so
  Expected in: flat namespace
 in /usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so
line   71:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'powerline_setup' is not defined
line   72:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'powerline_setup' is not defined
Press ENTER or type command to continue

A seção relevante do meu .vimrc :

python from powerline.vim import setup as powerline_setup
python powerline_setup()
python del powerline_setup

Usando o sistema python ( brew unlink python ) funciona.