{ ... }: {
  nixpkgs.config.allowUnfree = true;
  nix = {
    package = pkgs.nixUnstable;
    useSandbox = true;
    autoOptimiseStore = true;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
    trustedUsers = [ "@wheel" ];
    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 7d";
    };
    optimise = {
      automatic = true;
      dates = [ "weekly" ];
    };
  };
}