anchor.diff:  , curl, libmms
   # input plugins
   , libmad, taglib, libvorbis, libogg, flac, libmpcdec, libmodplug, libsndfile
  -, libcdio, cdparanoia, libcddb, faad2, ffmpeg_3, wildmidi
  +, libcdio, cdparanoia, libcddb, faad2, ffmpeg, wildmidi
   # output plugins
   , alsaLib, libpulseaudio
   # effect plugins
  
positive.code: 
    meta = with lib; {
      description = "Qt-based audio player that looks like Winamp";
      homepage = "http://qmmp.ylsoftware.com/";
      license = licenses.gpl2;
      platforms = platforms.linux;
      maintainers = [ maintainers.bjornfor ];
      repositories.svn = "http://qmmp.googlecode.com/svn/";
    };
  }
  
negative.code:       curl libmms
        # input plugins
        libmad taglib libvorbis libogg flac libmpcdec libmodplug libsndfile
        libcdio cdparanoia libcddb faad2 ffmpeg wildmidi
        # output plugins
        alsaLib libpulseaudio
        # effect plugins
  