};
    apps.aarch64-darwin = let
      system = "aarch64-darwin";
      pkgs = nixpkgs.legacyPackages.${system};
      self-pkgs = self.packages.${system};
      writeZsh = pkgs.writers.makeScriptWriter {interpreter = "${pkgs.zsh}/bin/zsh";};
    in {
      cls = {
        type = "app";
        buildInputs = [self-pkgs.cls];
        program = "${self-pkgs.cls}/bin/cls";
      };