{...}: {
  nix.settings = {
    substituters = [
      "https://nix-community.cachix.org/"
    ];
    trusted-public-keys = [
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
    ];
    auto-optimise-store = true;
    experimental-features = ["nix-command" "flakes"];
  };
  nixpkgs.config.allowUnfree = true;
}