nomicon/pkgs/tools/misc/teamocil/gemset.nix

{
  teamocil = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "1l5f33faipb45xx7ds67s7dqgvjlljlcxgpgig4pg8p002vg06r2";
      type = "gem";
    };
    version = "1.4.2";
  };
}