{
  ...
}: {
  nixpkgs.config.allowUnfree = true;
  programs.nix-index.enable = true;
  programs.command-not-found.enable = false;
  nix.settings = {
    auto-optimise-store = true;
    experimental-features = ["nix-command" "flakes"];
    substituters = [
      "https://cache.nixos.org"
    ];
    trusted-public-keys = [
      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
    ];
  };
}