anchor.diff:  , jansson
   , libvdpau
   , mesa_noglu
  +, nvidia-gpu-deployment-kit
   , pango
   , xorg
   
  
positive.code:     "GTK3_AVAILABLE=1"
      "NV_VERBOSE=1"
      "NV_USE_BUNDLED_LIBJANSSON=0"
      # TODO: package nvidia-gpu-deployment-kit
      "NVML_AVAILABLE=0"
    ];
  
    meta = with stdenv.lib; {
  
negative.code: 
  let
    inherit (stdenv.lib)
      bool01
      makeSearchPath;
  
    source = (import ./sources.nix { })."${channel}";
  