A quick Google search turns up this:
http://forum.kde.org/solved-kde4-compile-problem-kdelibs-nepomuk-t-36778.html#pid51479
It appears this is triggered by an outdated soprano installation.
- Bartosz
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Synopsis: x11/kdebase3 does not build on -CURRENT
Responsible-Changed-From-To: freebsd-ports-bugs-kde
Responsible-Changed-By: edwin
Responsible-Changed-When: Mon Mar 16 05:40:16 UTC 2009
Responsible-Changed-Why:
Over to maintainer (via the GNATS Auto Assign Tool)