The tests of dev-perl/Audio-Scan (#287264) rely on a patched version of libid3tag. Maybe some of the patches are applicable for media-libs/libid3tag. See: http://cpansearch.perl.org/src/AGRUNDMA/Audio-Scan-0.56/libid3tag/patches/ http://cpansearch.perl.org/src/AGRUNDMA/Audio-Scan-0.56/libid3tag/README.patches
Torsten, go ahead and apply what you need but make sure reverse deps don't break...