NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST ntp-4.2.4p6 x86_64-linux /nix/store/rczgwhr9gvaxmsm5q1gxz71wnwjq9jxd-ntp-4.2.4p6.drv /nix/store/3r2n69zw05pw9ckvwpiqjhy1vn26bg64-ntp-4.2.4p6