As mentioned before, KDE 4.2 is now available for FreeBSD.
To upgrade KDE 4.1.4 to the latest and the greatest, enter the following:
Ensure your ports directory is up-to-date and you’re su (superuser)
# pkg_delete -f kde\*4.1.4\* automoc4-\*# portupgrade -a# cd ${PORTSDIR}/x11/kde4 && make config && make install clean