{ config, lib, osConfig, ... }:
{
  options.desktop = {
    windowManager = lib.pantheon.mkStrOption;
  };


  config =  {
    assertions =
      [ 
        { 
          assertion = (osConfig.desktop.windowManager == config.desktop.windowManager);
          message =  "You have set your home window manager to one that is not installed on this system.";
        }
      ];
  };
}