MPI_Address() was removed from the MPI API in the MPI-3 specification so it should be removed from mpich's mpi.h as well. Still present in 3.1 and current repository. - Orion -- Orion Poplawski Technical Manager 303-415-9701 x222 NWRA/CoRA Division FAX: 303-415-9702 3380 Mitchell Lane orion at cora.nwra.com Boulder, CO 80301 http://www.cora.nwra.com