anchor.diff:    sconsFlags = [
       "build=release"
       "qtdir=${qt4}"
  +    "faad=1"
     ];
   
     buildPhase = ''
  
positive.code:  ];
  
    buildInputs = [
      chromaprint fftw flac libid3tag libmad libopus libshout libsndfile
      libusb1 libvorbis pkgconfig portaudio portmidi protobuf qt4
      rubberband scons sqlite taglib vampSDK
    ];
  
negative.code: { stdenv, fetchurl, chromaprint, fetchpatch, fftw, flac, faad2, mp4v2
  , libid3tag, libmad, libopus, libshout, libsndfile, libusb1, libvorbis
  , pkgconfig, portaudio, portmidi, protobuf, qt4, rubberband, scons, sqlite
  , taglib, vampSDK
  }:
  
  