nixos-dotfiles/modules/desktop_manager/gdm.nix

{ pkgs, ... }:
{
  services.xserver.enable = true;
  services.xserver.excludePackages = [
    pkgs.xterm
  ];
  services.xserver.displayManager.gdm = {
    enable = true;
    wayland = false; # ew, its something new (gaming performance, screensharing, alacritty).
  };
}