There are instructions on how to compile development versions here:
I'd refer to Pat's slackbuild scripts for the KDE which shipped with 10.2 for any quirks.
Note: There may be other options you want to compile in. Check the './configure --help' page for each package for details.
Note 2: I'm not 100% sure, because I haven't tried it, but Pat's 3.4 slackbuild script may work out of the box with the newer version. The KDE team are pretty consistent with their source package names.