txStatsD doesn't install with pip

This error happens when trying to install with pip:

pip install txstatsd -U
Downloading/unpacking txstatsd
  Downloading txStatsD-1.0.0.tar.gz (51kB): 51kB downloaded
  Running setup.py egg_info for package txstatsd

    package init file 'twisted/plugins/__init__.py' not found (or not a regular file)
Installing collected packages: txstatsd
  Running setup.py install for txstatsd
    usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
       or: -c --help [cmd1 cmd2 ...]
       or: -c --help-commands
       or: -c cmd --help

    error: option --single-version-externally-managed not recognized
    Complete output from command /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c "import setuptools;__file__='/var/folders/sr/c63gdn497h99hwk3q6y17v5h0000gn/T/pip-build/txstatsd/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/sr/c63gdn497h99hwk3q6y17v5h0000gn/T/pip-Db9xm1-record/install-record.txt --single-version-externally-managed:
    usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]

   or: -c --help [cmd1 cmd2 ...]

   or: -c --help-commands

   or: -c cmd --help

error: option --single-version-externally-managed not recognized

----------------------------------------
Command /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c "import setuptools;__file__='/var/folders/sr/c63gdn497h99hwk3q6y17v5h0000gn/T/pip-build/txstatsd/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/sr/c63gdn497h99hwk3q6y17v5h0000gn/T/pip-Db9xm1-record/install-record.txt --single-version-externally-managed failed with error code 1 in /var/folders/sr/c63gdn497h99hwk3q6y17v5h0000gn/T/pip-build/txstatsd
Storing complete log in /Users/kevin/.pip/pip.log

It looks like the issue is with overriding the command class for install: https://groups.google.com/forum/?fromgroups=#!topic/python-virtualenv/OYClg6j5cE4

When faced with this issue, I used the technique in this SO answer to populate the dropin cache: http://stackoverflow.com/a/7525163/74375