releng-tool is developed in Python is requires either Python 2.7 or 3.4+ to
run on a host system. A series of optional tools are required if certain stages
and/or features are used. For example, projects fetching sources from Git will
git tool installed; projects with patches will required the
patch tool. While some features may be operating system-specific (e.g.
autotools features are designed for Linux-based hosts), releng-tool can work on
various operating system variants.