{ pkgs, ... }: {
  # Enabling Gnome causes the machien to sleep.  Disable all of these.
  systemd.targets.sleep.enable = false;
  systemd.targets.suspend.enable = false;
  systemd.targets.hibernate.enable = false;
  systemd.targets.hybrid-sleep.enable = false;

  services.xrdp = {
    enable = true;
    defaultWindowManager = "${pkgs.gnome.gnome-session}/bin/gnome-session";
    openFirewall = true;
    # confDir = "/etc/xrdp/conf";
  };

  environment.systemPackages = [
    pkgs.xrdp
  ];

  # XRDP needs IPv6 disabled to function.
  boot.kernel.sysctl = { 
    "net.ipv6.conf.enp0s13f0u1.disable_ipv6" = true;
    "net.ipv6.conf.all.disable_ipv6" = true;
    "net.ipv6.conf.wlp170s0.disable_ipv6" = true;
  };

  # https://nixos.wiki/wiki/Polkit
  security.polkit.extraConfig = ''
    polkit.addRule(function(action, subject) {
      if (
        subject.isInGroup("users")
          && (
            action.id == "org.freedesktop.login1.reboot" ||
            action.id == "org.freedesktop.login1.reboot-multiple-sessions" ||
            action.id == "org.freedesktop.login1.power-off" ||
            action.id == "org.freedesktop.login1.power-off-multiple-sessions"
          )
        )
      {
        return polkit.Result.YES;
      }
    })
  '';
}