Guix is Nix[0] from Guile[1]!

Concretely, it allows Nix package management to be done entirely in
Scheme. The goal is to investigate whether Scheme, and in particular
the ability to define EDSLs, would allow it to fulfill the role of the
Nix language.

[0] http://nixos.org/nix/
[1] http://gnu.org/software/guile/