_: {
  nh = {
    enable = true;
    clean = {
      enable = true;
      dates = "weekly";
      extraArgs = "--keep-since 3d --keep 5";
    };
  };

  nix = {
    settings = {
      extra-experimental-features = ["flakes" "nix-command"];
      auto-optimise-store = true;
      builders-use-substitutes = true;
      keep-outputs = true;
      allowed-users = ["@wheel"];
      trusted-users = ["root" "@wheel"];
      substituters = [
        "https://cache.flake.sh/kyasshu"
        "https://cache.nixos.org"
      ];
      trusted-public-keys = [
        "kyasshu:g1heIgCgG7M4San6nRsz/omcVQ1GTc7+zKKm3L9Co7o="
        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
      ];
    };
  };

  nixpkgs.config.allowUnfree = true;
}