anchor.diff:      "GTK3_AVAILABLE=1"
       "NV_VERBOSE=1"
       "NV_USE_BUNDLED_LIBJANSSON=0"
  -    # TODO: package nvidia-gpu-deployment-kit
  -    "NVML_AVAILABLE=0"
  +    "NVML_AVAILABLE=${bool01 (nvidia-gpu-deployment-kit != null)}"
     ];
   
     meta = with stdenv.lib; {
  
positive.code: , jansson
  , libvdpau
  , mesa_noglu
  , pango
  , xorg
  
  
negative.code:     jansson
      libvdpau
      mesa_noglu
      nvidia-gpu-deployment-kit
      pango
      xorg.libX11
      xorg.libXext
  