anchor.diff: -{ stdenv, fetchurl, scons, pkgconfig, qt4, portaudio, portmidi, libusb1
  -, libmad, protobuf, libvorbis, taglib, libid3tag, flac, libsndfile, libshout
  -, rubberband, fftw, vampSDK, chromaprint, libopus, sqlite
  +{ stdenv, fetchurl, chromaprint, fftw, flac, libid3tag, libmad
  +, libopus, libshout, libsndfile, libusb1, libvorbis, pkgconfig
  +, portaudio, portmidi, protobuf, qt4, rubberband, scons, sqlite
  +, taglib, vampSDK
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     runHook postInstall
    '';
  
    meta = {
      homepage = "http://mixxx.org/";
      description = "Digital DJ mixing software";
      license = stdenv.lib.licenses.gpl2Plus;
      maintainers = [ stdenv.lib.maintainers.aszlig ];
      platforms = stdenv.lib.platforms.linux;
    };
  }
  
negative.code:   };
  
    buildInputs = [
      chromaprint fftw flac libid3tag libmad libopus libshout libsndfile
      libusb1 libvorbis pkgconfig portaudio portmidi protobuf qt4
      rubberband scons sqlite taglib vampSDK
    ];
  
    sconsFlags = [
      "build=release"
      "qtdir=${qt4}"
    ];
  
    buildPhase = ''
      runHook preBuild
  