anchor.diff:  
     meta = with stdenv.lib; {
       description = "Common interface to speech synthesis";
  -    homepage = https://devel.freebsoft.org/speechd;
  +    homepage = "https://devel.freebsoft.org/speechd";
       license = licenses.gpl2Plus;
       maintainers = with maintainers; [ berce ];
       platforms = platforms.linux;
  
positive.code:     sha256 = "1wvck00w9ixildaq6hlhnf6wa576y02ac96lp6932h3k1n08jaiw";
    };
  
    nativeBuildInputs = [ pkgconfig autoreconfHook intltool libtool itstool texinfo wrapPython ];
  
    buildInputs = [ glib dotconf libsndfile libao libpulseaudio alsaLib python ]
      ++ optionals withEspeak [ espeak sonic pcaudiolib ]
      ++ optional withFlite flite
      ++ optional withPico svox
      # TODO: add flint/festival support with festival-freebsoft-utils package
      # ++ optional withFestival festival-freebsoft-utils
  
negative.code: { stdenv
  , pkgconfig
  , fetchurl
  , python3Packages
  , intltool
  , itstool
  , libtool
  , texinfo
  , autoreconfHook
  , glib
  , dotconf
  , libsndfile
  , withLibao ? true, libao
  , withPulse ? false, libpulseaudio
  , withAlsa ? false, alsaLib
  