d5763a8288
Per http://www.open-mpi.org/community/lists/devel/2015/08/17775.php, some compilers don't like it when there's a .f90 file that only contains comments (and no actual Fortran code). So if OMPI determines that the Fortran compiler does not support enough Fortran mojo to support MPI_SIZEOF, generate at least one dummy Fortran subroutine that can be compiled in an otherwise barren Fortran landscape that is devoid of life and hope.