anchor.diff:  
   let
     inherit (stdenv.lib)
  +    bool01
       makeSearchPath;
   
     source = (import ./sources.nix { })."${channel}";
  
positive.code:     jansson
      libvdpau
      mesa_noglu
      pango
      xorg.libX11
      xorg.libXext
  
negative.code: , jansson
  , libvdpau
  , mesa_noglu
  , nvidia-gpu-deployment-kit
  , pango
  , xorg
  
  