anchor.diff:      gtk2
       gtk3
       iso-codes
  +    json-glib
       libnotify
       libxkbcommon
       python3
  
positive.code:     "--enable-ui"
      "--enable-engine"
      "--enable-libnotify"
      "--with-python=${python3.interpreter}"
    ];
  
    preConfigure = ''
      substituteInPlace data/dconf/Makefile.in \
        --replace "dconf update" "echo"
      sed -i configure \
        -e "s|PYTHON2_LIBDIR=.*|PYTHON2_LIBDIR=$out/lib/${python3.libPrefix}|"
    '';
  
negative.code: , gtk2
  , gtk3
  , iso-codes
  , json-glib
  , libnotify
  , libxkbcommon
  , python3
  