Hi all, I figure this is one of those things in the standard, but I figured I'd get a better explanation asking here than digging through that myself. Long story short, if I try the following code: *program foo* * use mpi, only: mpi_bcast* *end program foo* ... This fails to compile in MPICH (3.4.2, at least), IntelMPI and MVAPICH, but *does* work on OpenMPI and SGI MPT, at least on systems I've tried. Replacing the 'use, only' with just a 'use' directive works fine. And MPI_BCAST is just an example here; things like 'MPI_Finalize' and 'MPI_Integer' appear to be in the module, but MPI_Send also fails. Is this a scenario where the standard doesn't support this, but OpenMPI and MPT do it as a matter of convenience vs strict adherence found in the MPICH-based libraries? Or am I missing some simple issue? Any insight would be greatly appreciated! Thanks, - Brian