{ lib, inputs, config, pkgs, username, hostname, gpu, ... }: {
  # 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;
  };

  # Configure keymap in X11
  services.xserver = {
    enable = true;
    layout = "us";
    xkbVariant = "";
    autorun = true;
    desktopManager.xfce.enable = true;
  };

  environment.systemPackages = with pkgs; [
    arc-kde-theme
    arc-theme
    papirus-icon-theme
    plasma-theme-switcher
    tailscale-systray
  ];
}