/usr/include/libtomahawk/filemetadata/ is in libtomahawk-dev 0.8.4+dfsg1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libtomahawk/filemetadata/MetadataEditor.h
/usr/include/libtomahawk/filemetadata/MusicScanner.h
/usr/include/libtomahawk/filemetadata/ScanManager.h
/usr/include/libtomahawk/filemetadata/taghandlers/
/usr/include/libtomahawk/filemetadata/taghandlers/apetag.h
/usr/include/libtomahawk/filemetadata/taghandlers/asftag.h
/usr/include/libtomahawk/filemetadata/taghandlers/id3v1tag.h
/usr/include/libtomahawk/filemetadata/taghandlers/id3v2tag.h
/usr/include/libtomahawk/filemetadata/taghandlers/mp4tag.h
/usr/include/libtomahawk/filemetadata/taghandlers/oggtag.h
/usr/include/libtomahawk/filemetadata/taghandlers/tag.h