NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST thunderbird-2.0.0.21 x86_64-linux /nix/store/l7x5lmsr2nlpqbaxsv0640gsvr9yfhfr-thunderbird-2.0.0.21.drv /nix/store/z7q3ji6fn08mwfkhwjd8r3r9n0g2krna-thunderbird-2.0.0.21