anchor.diff:      openchrome = { modules = [ xorg.xf86videoopenchrome ]; };
       cirrus =     { modules = [ xorg.xf86videocirrus ]; };
       vmware =     { modules = [ xorg.xf86videovmware ]; };
  -    vboxvideo =  { modules = [ kernelPackages.virtualboxGuestAdditions ]; };
  +    virtualbox = { modules = [ kernelPackages.virtualboxGuestAdditions ]; };
     };
   
     videoDriver = cfg.videoDriver;
  
positive.code:     environment.systemPackages = config.environment.x11Packages;
      
      services.hal.packages = halConfigFiles ++
        optional (videoDriver == "vboxvideo") kernelPackages.virtualboxGuestAdditions;
  
      jobs.xserver =
        { startOn = if cfg.autorun then "hal" else "never";
  
negative.code:     services.xserver.deviceSection =
        ''
          Identifier "Device[0]"
          Driver "${if cfg.videoDriver == "nvidiaLegacy" then "nvidia" 
  	          else if cfg.videoDriver == "virtualbox" then "vboxvideo"
  	          else cfg.videoDriver}"
  
          ${if cfg.videoDriver == "nvidiaLegacy" then ''
          # This option allows suspending with a nvidiaLegacy card
  