nixpkgs/pkgs/applications/networking/wayback_machine_downloader/gemset.nix

{
  wayback_machine_downloader = {
    groups = ["default"];
    platforms = [];
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "12kb1qmvmmsaihqab1prn6cmynkn6cgb4vf41mgv22wkcgv5wgk2";
      type = "gem";
    };
    version = "2.2.1";
  };
}