guix: guix (a purely functional package manager)
guix: 
guix: GNU Guix provides state-of-the-art package management features such
guix: as transactional upgrades and roll-backs, reproducible build
guix: environments, unprivileged package management, and per-user profiles.
guix: It uses low-level mechanisms from the Nix package manager, but
guix: packages are defined as native Guile modules, using extensions to the
guix: Scheme language—which makes it nicely hackable.
guix:
guix: Homepage: https://www.gnu.org/software/guix/
guix: