{...}: {
  nix = {
    settings.experimental-features = ["nix-command" "flakes"];
    gc = {
      automatic = true;
      dates = "daily";
      options = "--delete-older-than 7d";
    };
    extraOptions = ''
      keep-outputs = true
      keep-derivations = true
    '';
  };
  networking.networkmanager.enable = true;
  services.power-profiles-daemon.enable = true;
  virtualisation.podman.enable = true;
  programs = {
    ssh.startAgent = true;
    dconf.enable = true;
    fish.enable = true;
    zsh.enable = true;
  };
  fonts.fontconfig.enable = true;
  environment = {
    localBinInPath = true;
    shellAliases = {
      ll = "ls -l";
      nixos-update = "sudo nixos-rebuild switch --flake 'git+https://git.xenia.me.uk/xenia/nixos.git?ref=main'";
    };
  };

  services.xserver = {
    layout = "gb";
    xkbVariant = "";
  };
  console.keyMap = "uk";

  # Set your time zone.
  time.timeZone = "Europe/London";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_GB.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_GB.UTF-8";
    LC_IDENTIFICATION = "en_GB.UTF-8";
    LC_MEASUREMENT = "en_GB.UTF-8";
    LC_MONETARY = "en_GB.UTF-8";
    LC_NAME = "en_GB.UTF-8";
    LC_NUMERIC = "en_GB.UTF-8";
    LC_PAPER = "en_GB.UTF-8";
    LC_TELEPHONE = "en_GB.UTF-8";
    LC_TIME = "en_GB.UTF-8";
  };

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
  };
  programs.noisetorch.enable = true;
}