He instaladovirtualenv viapip y obtenga este error después de crear un nuevo entorno:

selenium:~ auser$ virtualenv new  
New python executable in new/bin/python  
ERROR: The executable new/bin/python is not functioning  
ERROR: It thinks sys.prefix is u'/System/Library/Frameworks/Python.framework/    Versions/2.6' (should be '/Users/user/new')  
ERROR: virtualenv is not compatible with this system or executable  

En mi entorno:

PYTHONPATH=/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages  
PATH=/System/Library/Frameworks/Python.framework/Versions/2.6/bin:/Library/Frameworks/Python.framework/Versions/2.6/bin:/Library/Frameworks/Python.framework/Versions/2.6/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin  

¿Cómo puedo reparar esto?

Gracias