netflow indexer uses the python xapian bindings. The IPy module is used for some subnet calculations to support CIDR searching. On debian you can install all the dependencies using:
# apt-get install python-pip python-xapian xapian-tools python-ipy
I recommend installing netflow-indexer into a virtual environment:
# pip install -s -E /usr/local/python_env/ netflowindexer-0.1.9.tar.gz
Then modify your path or source the activation script:
# PATH=/usr/local/python_env/bin/:$PATH