Currently it&#x27;s a GNU&#x2F;Linux package manager, but there&#x27;s a working GNU Hurd port that is being finished up, and I don&#x27;t see a reason why someone couldn&#x27;t port it to one of the BSDs if they wanted to put in the effort.  Nix, the project Guix is based on, has been ported to OS X and there&#x27;s even an experimental Windows port, so its possible to support many systems.