Needs Qt5TextToSpeech to be added to FreeBSD image?
Example failures for master and stable:
https://build.kde.org/view/Applications/job/Applications%20kmouth%20kf5-qt5%20FreeBSDQt5.7/10/console
https://build.kde.org/view/Applications/job/Applications%20kmouth%20stable-kf5-qt5%20FreeBSDQt5.7/1/console