kdepim needs libical, available from here: http://sourceforge.net/projects/freeassociation/
It's a relatively small parser for PIM files.
You will also need libcaldav and libcarddav, both of which are available on the Trinity home page under "Related Projects".
Are these new dependencies? Or options?
What benefit do they provide? For example, I have no need for most of the bling some people think they need with email. I use a very basic KMail. Do I need these added dependencies?