{
  systemArch,
  nixpkgs-old,
  nixpkgs-latest,
  packagesConfig,
}:
{
  latestPackages = final: _: {
    latest = import nixpkgs-latest {
      system = systemArch;
      config = packagesConfig;
    };
  };

  oldPackages = final: _: {
    old = import nixpkgs-old {
      system = systemArch;
      config = packagesConfig;
    };
  };
}