{
  flake.modules.nixos.unfree = {
    config,
    lib,
    ...
  }: let
    cfg = config.arta.unfree;
  in {
    options.arta.unfree = {
      allow = lib.mkOption {
        type = lib.types.listOf lib.types.str;
        default = [];
      };
    };

    config = {
      nixpkgs.config.allowUnfreePredicate = pkg:
        builtins.elem (lib.getName pkg) cfg.allow;
    };
  };
}