eix -I qmmp
...
media-sound/qmmp
Installed versions: 1.1.2(10:25:13 26.07.2016)(aac alsa cdda cover cue curl ffmpeg flac kde lyrics mad mplayer oss pulseaudio qsui sndfile udisks vorbis -analyzer -bs2b -crossfade -enca -game -jack -ladspa -midi -mms -modplug -mpris -musepack -notifier -opus -projectm -scrobbler -soxr -stereo -tray -wavpack)
$ qmmp
QmmpUiPluginCache: loaded plugin libcovermanager.so
QmmpUiPluginCache: loaded plugin liblyrics.so
QmmpUiPluginCache: loaded plugin libskinned.so
MainWindow: detected wm: KWin
Skin: using /home/xor/.qmmp/cache/skin
Skin: cannot find region.txt. Transparency disabled
WindowSystem: setting sticky state of window 0x3000005 to false.
PlayListParser: loaded plugin libm3uplaylistformat.so <--- Trying to add mp3 into playlist
PlayListParser: loaded plugin libplsplaylistformat.so
PlayListParser: loaded plugin libxspfplaylistformat.so
QmmpPluginCache: loaded plugin libhttp.so
QmmpPluginCache: loaded plugin libcdaudio.so
QmmpPluginCache: loaded plugin libcue.so
QmmpPluginCache: loaded plugin libsndfile.so
QmmpPluginCache: loaded plugin libffmpeg.so
QmmpPluginCache: loaded plugin libmplayer.so
QMMP's playlist is empty. Cannot add mp3 files there at all.
You should install taglib >= 1.10 and recompile qmmp.
Thanks. It solved my issue. I will try to update Gentoo ebuild's dependencies accordingly. Am I right that qmmp-1.1.1 also needs at least taglib >= 1.10?
Yes, qmmp 1.1 requres taglib >= 1.10.