anchor.diff:  { stdenv
  -, pythonPackages
  +, python3Packages
   , fetchurl
   , gettext
   , gobject-introspection
  
positive.code:     "prefix=${placeholder "out"}"
    ];
  
    strictDeps = false;
  
    meta = with stdenv.lib; {
  
negative.code:     libnotify
    ];
  
    propagatedBuildInputs = with python3Packages; [
      chardet
      pygobject3
      requests
  