QFontDatabase does not return fontlist for Simplified and Traditional Chinese languages on Mac OS X

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QFontDatabase fdb;
    qDebug() << fdb.families(QFontDatabase::TraditionalChinese );
    qDebug() << fdb.families(QFontDatabase::SimplifiedChinese );
    return a.exec();
}