The package does not appear to be available via pip, as recommended as an installation method in the README.
$ pip install cdxj-indexer
Collecting cdxj-indexer
Could not find a version that satisfies the requirement cdxj-indexer (from versions: )
No matching distribution found for cdxj-indexer
$ python --version
Python 2.7.13
$ pip --version
pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)
The package does not appear to be available via pip, as recommended as an installation method in the README.