[CMake] define addition search path for .cmake files

[cmake at a.legko.ru]

Hi!

So, I have separate installation (root) path for a project, many libs 
there, installing their own *.cmake files (VTK,
etc.) files into that root.
How to define (add) alternative paths for cmake to search for *.cmake 
files?
Testing environment variables without any effect (CMAKE_*).
The idea to change original cmake files in each source package is not a 
good one.


Thanx!