NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST keen4 i686-linux /nix/store/0paj9z0687ia941dr03mr6a60saar4lf-keen4.drv /nix/store/wc6504gvd4gwzvhpvhqfbw06d5gjgn89-keen4