Detecting old installs of kdepimlibs

[Allen Winter]

Howdy,

Is there a slick way for FindKdepimlibs.cmake  to detect that the
currently installed version is too old?

i.e suppose I forget to install kdepimlibs 4.1 before installing kdepim 4.1
and I still have kdepimlibs 4.0 installed

Currently, FindKdepimLibs.cmake simply looks if a certain header is
installed, and if it is, happily reports the found condition.

I suppose we could install a kdepimlibs.h with a version number in it
and grep for that version.

kdelibs seems to do something with a KDELibsDependencies.cmake file
but I can't make out what's really happening there.

-Allen