[illuminati ~]$ pex gevent==1.1.1 eventlet==0.19.0 -o /tmp/throwaway.pex 
[illuminati ~]$ /tmp/throwaway.pex 
Python 2.7.10 (default, Dec 16 2015, 14:09:45) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> import gevent, eventlet
>>> gevent.__file__, eventlet.__file__
('/Users/kwilson/.pex/install/gevent-1.1.1-cp27-cp27m-macosx_10_6_intel.whl.035d180d2f5334b5663081b1f63f808fb007988c/gevent-1.1.1-cp27-cp27m-macosx_10_6_intel.whl/gevent/__init__.py', '/Users/kwilson/.pex/install/eventlet-0.19.0-py2.py3-none-any.whl.79bdf5f606bdce7c66b2a7c0b23fb7f07d6c3034/eventlet-0.19.0-py2.py3-none-any.whl/eventlet/__init__.py')
>>>