When packaging kdepim I cmake configuration requires the following 
packages be installed
Are the really needed?

trinity-kdepim W: Dependency included and not needed ('cyrus-sasl')
trinity-kdepim W: Dependency included and not needed ('gpgme')
trinity-kdepim W: Dependency included and not needed ('libical')
trinity-kdepim W: Dependency included and not needed ('trinity-arts')

As far as I can tell nothing links to them.

README.licical gives:
The directory libkcal/libical contains version 0.24 of libical with KDE 
local
modifications to fix some bugs and let it compile in the kdepim module.
You may obtain the original distribution from
   http://sourceforge.net/projects/freeassociation/