[Carpetsmoker]

# pkg_info -aqo | sort | grep -i kde

From pkg_info(1)

    -a, --all
	     Show all currently installed packages.

     -q, --quiet
	     Be ``quiet'' in emitting report headers and such, just dump the
	     raw info (basically, assume a non-human reading).

     -o      Show the ``origin'' path recorded on package generation.  This
	     path is the directory name in the FreeBSD Ports Collection of the
	     underlying port from which the package was generated.

Try adding exec startkde in your ~/.xinitrc and use xinit to start KDE, this might give some useful info.