{ lib, config, pkgs, ... }:
{
  options.swarselsystems.modules.optional.virtualbox = lib.mkEnableOption "optional VBox settings";
  config = lib.mkIf config.swarselsystems.modules.optional.virtualbox {
    specialisation = {
      VBox.configuration = {
        virtualisation.virtualbox = {
          host = {
            enable = true;
            enableExtensionPack = true;
          };
          # leaving this here for future notice. setting guest.enable = true will make 'restarting sysinit-reactivation.target' take till timeout on nixos-rebuild switch
          guest = {
            enable = false;
          };
        };
        # run an older kernel to provide compatibility with windows vm
        boot.kernelPackages = lib.mkForce pkgs.linuxPackages;
      };
    };
  };

}