Python library gevent, version 0.13.6 (the current version on PyPI) will not pip install on OS X Lion, Python 2.7 (and probably others.) It works f
gevent
pip install
This is the way I found the easiest:
install libevent using homebrew
$ brew install libevent
install gevent
$ pip install gevent
This was the only way I could get it to work.