When we last left this build there was a link error on boost::mpi::communicator::operator ompi_communicator_t*() const, there is a mailing list discussion describing a similar problem on Sparc. That discussion hints at there being multiple mpi implementations and that boost has been linked against OpenMPI while the linker has found a different implementation first.
Building libboost_mpi (and, actually, all of boost) resolves this problem.
Fixed in build 91.
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