The current CMake system does not build the OpenInventor driver. Addition of this requires a) A user option to enable/disable this optional component b) A 'FindInventor.cmake' module to locate the Inventor headers and libraries. c) Addition of a sources.cmake file to build the Geant4 OpenInventor driver.
First fix for this is in tags cmake-V09-04-32 openinventor-V09-04-02 Only tested so far with Coin3d/SoXt, but should function with SoWin as well.