Apart from cairo, there are a couple of other
new packages in Slackware-current. You should download and install them too, since slackpkg will most probably not have installed those either.
Remember that with Slackware-current, you can expect that new
packages may be added during development. For the released versions (like, Slackware 10.2) all that will ever be published after release are patches and bugfixes, i.e. upgrades
packages. This is where the 3rd party package managers like slapkpg, slapt-get, swaret etc... will work mostly correctly. With Slackware-current you should always
read the ChangeLog.txt
as well, before trying to use a 3rd party package manager to upgrade!
The new -current packages since Slackware 10.2 (I hope I didn't miss any):
Those last two are replacing the old db packages that were removed. The linuxdoc-tools is a replacement for the removed sgml-tools.