[OMPI users] OpenMPI build and OFED versions - rebuild necessary?

[Sasso, John (GE Power & Water, Non-GE)]

On RHEL 5 hosts which have OFED 1.5 installed, we have builds of OpenMPI 1.4.5 
and 1.6.5 in place.

On RHEL 6 hosts we have OFED 2.4 installed.  Will we need to rebuild OpenMPI 
1.4.5 and 1.6.5, or can our existing builds of such still work on the RHEL 6 
hosts?

                    --john