anchor.diff: -{ stdenv, mkDerivation, fetchFromGitHub, makeWrapper, chromaprint
  +{ stdenv, mkDerivation, fetchFromGitHub, chromaprint
   , fftw, flac, faad2, glibcLocales, mp4v2
   , libid3tag, libmad, libopus, libshout, libsndfile, libusb1, libvorbis
   , libGLU, libxcb, lilv, lv2, opusfile
  
positive.code:     "opus=1"
    ];
  
    fixupPhase = ''
      wrapProgram $out/bin/mixxx \
        --set LOCALE_ARCHIVE ${glibcLocales}/lib/locale/locale-archive;
    '';
  
    meta = with stdenv.lib; {
      homepage = https://mixxx.org;
  
negative.code:     sha256 = "1q6c2wfpprsx7s7nz1w0mhm2yhikj54jxcv61kwylxx3n5k2na9r";
    };
  
    buildInputs = [
      chromaprint fftw flac faad2 glibcLocales mp4v2 libid3tag libmad libopus libshout libsndfile
      libusb1 libvorbis libxcb libGLU lilv lv2 opusfile pkgconfig portaudio portmidi protobuf qtbase qtscript qtsvg
  