anchor.diff:  
       
     modules = 
  -    optional (videoDriver == "nvidia") pkgs.nvidiaDrivers ++       #make sure it first loads the nvidia libs
  -    [
  +    optional (videoDriver == "nvidia") pkgs.nvidiaDrivers #make sure it first loads the nvidia libs
  +    ++ [
         xorg.xorgserver
         xorg.xf86inputkeyboard
         xorg.xf86inputmouse
  
positive.code:     env SLIM_THEMESDIR=${slimThemesDir}
      env FONTCONFIG_FILE=/etc/fonts/fonts.conf # !!! cleanup
      env XKB_BINDIR=${xorg.xkbcomp}/bin # Needed for the Xkb extension.
      env LD_LIBRARY_PATH=${xorg.libX11}/lib:${xorg.libXext}/lib:/usr/lib/ # related to xorg-sys-opengl - needed to load libglx for (AI)GLX support (for compiz)
  
      ${if videoDriver == "nvidia"
        then "env XORG_DRI_DRIVER_PATH=${pkgs.nvidiaDrivers}/X11R6/lib/modules/drivers/"
      else if cfg.driSupport
        then "env XORG_DRI_DRIVER_PATH=${pkgs.mesa}/lib/modules/dri"
        else ""
      } 
  
      exec ${pkgs.slim}/bin/slim
    '';
  
negative.code:     
        rm -f /var/run/opengl-driver
        ${if videoDriver == "nvidia"        
          then ''
            ln -sf ${pkgs.nvidiaDrivers} /var/run/opengl-driver
            # Ideally, the nvidia driver would be somewhere where modprobe looks for it...
            ${pkgs.module_init_tools}/sbin/insmod ${pkgs.nvidiaDrivers}/lib/nvidia.ko || true
          ''
  	else if cfg.driSupport
          then "ln -sf ${pkgs.mesa} /var/run/opengl-driver"
          else ""
  