GNU Guix (pronounced /gi:ks/, "Guix" is a portmanteau of "Guile" and "Nix") is a purely functional package manager and a stateless operating system from the GNU project. The package manager is based on Nix and is powered by Guile. The OS includes a Linux-Libre kernel and GNU Shepherd, a Scheme-based init system. Support for the Hurd is being worked on. Guix has unique features that can't be found in most other Unix-like systems: fully declarative system configuration, software profiles that can be independently managed by users, package definitions in Guile, safe atomic upgrades, whole-system and single-package roll-backs.