nixpkgs/pkgs/applications/audio/tree-from-tags/gemset.nix

{
  taglib-ruby = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "0r8g7zdncc6243d000jn0grc1n70rn9mx16vggy3q7c4wgsa37xi";
      type = "gem";
    };
    version = "0.7.1";
  };
}