anchor.diff:  # TODO add plugins having various licenses, see http://www.vamp-plugins.org/download.html
   
  -{ stdenv, fetchurl, alsaLib, bzip2, fftw, jackaudio, libX11, liblo,
  -libmad, libogg, librdf, librdf_raptor, librdf_rasqal, libsamplerate,
  -libsndfile, makeWrapper, pkgconfig, pulseaudio, qt4, redland, rubberband, vampSDK
  +{ stdenv, fetchurl, alsaLib, bzip2, fftw, jackaudio, libX11, liblo
  +, libmad, libogg, librdf, librdf_raptor, librdf_rasqal, libsamplerate
  +, libsndfile, makeWrapper, pkgconfig, pulseaudio, qt4, redland
  +, rubberband, vampSDK 
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:   buildInputs =
      [ libsndfile qt4 fftw /* should be fftw3f ??*/ bzip2 librdf rubberband
        libsamplerate vampSDK alsaLib librdf_raptor librdf_rasqal redland
        # optional
        jackaudio
        pkgconfig
        # portaudio
        pulseaudio
        libmad
  
negative.code:     description = "View and analyse contents of music audio files";
      homepage = http://www.sonicvisualiser.org/;
      license = "GPLv2";
      maintainers = 
        [ stdenv.lib.maintainers.marcweber 
          stdenv.lib.maintainers.goibhniu 
        ];
      platforms = stdenv.lib.platforms.linux;
    };
  }
  