anchor.diff:    services.mingetty.ttys = ttys ++ optional (!cfg.graphics) "ttyS0";
   
     # Wireless won't work in the VM.
  -  networking.enableWLAN = mkOverrideTemplate 50 {} false;
  +  networking.enableWLAN = mkOverride 50 false;
   }
  
positive.code: 
    # When building a regular system configuration, override whatever
    # video driver the host uses.
    services.xserver.videoDriver = mkOverrideTemplate 50 {} null;
    services.xserver.videoDrivers = mkOverrideTemplate 50 {} [ "cirrus" "vesa" ];
    services.xserver.defaultDepth = mkOverrideTemplate 50 {} 0;
    services.xserver.monitorSection =
      ''
        # Set a higher refresh rate so that resolutions > 800x600 work.
  
negative.code:   # host filesystem and thus deadlocks the system.
    networking.useDHCP = false;
  
    networking.defaultGateway = mkOverride 200 "10.0.2.2";
  
    networking.nameservers = [ "10.0.2.3" ];
  
  