need to check Xi lib version

[Andriy Rysin]

Hi all

in kxkb I need to check that Xi lib version is >= 1.2.0 (bug 182955)
it looks like most checks for X11 libs defined in kdelibs/cmake but
there's no check for their versions.

Is there a quick way to check the Xi lib version without writing too
cmake code myself?

thanks,
Andriy