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.
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.