title: get errors when import lxml.etree to python
body: <p>i have installed an lxml on my mac, when i type in python like this</p>
  
  <pre>
  localhost:lxml-3.0.1 apple$ python
  Python 2.7.3 (v2.7.3:70274d53c1dd, Apr  9 2012, 20:52:43) 
  [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from lxml import etree
  Traceback (most recent call last):
    File "", line 1, in 
  ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/lxml-3.0.1-py2.7-macosx-10.6-intel.egg/lxml/etree.so, 2): Symbol not found: ___xmlStructuredErrorContext
    Referenced from: /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/lxml-3.0.1-py2.7-macosx-10.6-intel.egg/lxml/etree.so
    Expected in: flat namespace
   in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/lxml-3.0.1-py2.7-macosx-10.6-intel.egg/lxml/etree.so
  </pre>