You must have Python 3.6 or later, and a relatively recent version of Git. Git 2.1.4 (shipped with Debian Jessie) is known to work. More recent versions should work and are supported.

Install with pip, preferably in a virtual environment:

$ python3 -m venv /path/to/your/virtualenv
$ source /path/to/your/virtualenv/bin/activate
$ pip install "check-oldies[toml]"


If you do not need to read TOML configuration files, you may omit the optional dependency and install like this:

$ pip install check-oldies

Configuration files are not required, but some options are only available through configuration files. If you are not sure, do not use the latter command. Instead, use pip install check-oldies[toml] as indicated above.