Installing root and geant4 together!

I have installed Root and Geant4 and running an example .
Also I have defined both environments but an error comes that says "cannot find GCCXML " or something like that .
Can you tell me what is GCCXML and how can I find it.
As you may know root is a good software for analyzing Geant4 data,
So I exactly want to know how it they work together?

Would you guide me please?


you can check out (!) GCCXML from It is used by Geant4 to create dictionaries, see the ROOT user manual on what those are used for.

Cheers, Axel.