anchor.diff: -{ stdenv, lib, fetchurl, SDL2, libogg, libvorbis, enableNativeMidi ? false }:
  +{ stdenv, lib, fetchurl, SDL2, libogg, libvorbis, smpeg, flac, enableNativeMidi ? false, fluidsynth ? null }:
   
   stdenv.mkDerivation rec {
     name = "SDL2_mixer-${version}";
  
positive.code:     description = "SDL multi-channel audio mixer library";
      platforms = platforms.linux;
      homepage = "https://www.libsdl.org/projects/SDL_mixer/";
      license = licenses.zlib;
    };
  }
  
negative.code:     sha256 = "0pv9jzjpcjlbiaybvwrb4avmv46qk7iqxlnqrd2dfj82c4mgc92s";
    };
  
    propagatedBuildInputs = [ SDL2 libogg libvorbis fluidsynth smpeg flac ];
  
    configureFlags = [ "--disable-music-ogg-shared" ] ++ lib.optional enableNativeMidi "--enable-music-native-midi-gpl";
  
  