anchor.diff:    };
   
     buildInputs = [
  -    chromaprint fftw flac faad2 glibcLocales mp4v2 libid3tag libmad libopus libshout libsndfile
  +    chromaprint fftw flac faad2 glibcLocales mp4v2 libid3tag libmad libopus libshout241 libsndfile
       libusb1 libvorbis libxcb libGLU lilv lv2 opusfile pkgconfig portaudio portmidi protobuf qtbase qtscript qtsvg
       qtx11extras rubberband scons sqlite taglib upower vamp-plugin-sdk
     ];
  
positive.code: { stdenv, mkDerivation, fetchFromGitHub, chromaprint
  , fftw, flac, faad2, glibcLocales, mp4v2
  , libid3tag, libmad, libopus, libshout, libsndfile, libusb1, libvorbis
  , libGLU, libxcb, lilv, lv2, opusfile
  
negative.code: , qtx11extras, rubberband, scons, sqlite, taglib, upower, vamp-plugin-sdk
  }:
  
  let
    # Because libshout 2.4.2 and newer seem to break streaming in mixxx, build it
    # with 2.4.1 instead.
    libshout241 = libshout.overrideAttrs (o: rec {
      name = "libshout-2.4.1";
      src = fetchurl {
        url = "http://downloads.xiph.org/releases/libshout/${name}.tar.gz";
        sha256 = "0kgjpf8jkgyclw11nilxi8vyjk4s8878x23qyxnvybbgqbgbib7k";
      };
    });
  in
  mkDerivation rec {
    pname = "mixxx";
    version = "2.2.3";
  