If you try to build somewhere out of tree, not in a subdir of the
source, the Fortran build is likely to fail because mpi-ext-module.F90
does
include
'<srcdir>/openmpi-4.0.0/ompi/mpiext/pcollreq/mpif-h/mpiext_pcollreq_mpifh.h'
and can exceed the fixed line length. It either needs to add (the
compiler's equivalent of gfortran's) -ffixed-line-length-none to FFLAGS
or, I guess, set the include path; the latter may be more robust.
[The situation arises, for instance, if the source location is
read-only. I haven't checked, but I think this was OK in v3.]
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