Hello!
It may be that you are running into this issue, reported earlier:
HDF5 does not compile with OpenMPI 4.0.0
Do you see these undefined references, as well?:
MPI_Type_extent, MPI_Address and MPI_Type_struct
HDF5 uses MPI functions that were deprecated since MPI 2.0. With OpenMPI 4.0, those deprecated functions were deleted. This caused the compiler to complain about missing MPI calls.
We have fixed this issue for the HDF5-1.10.5 release that we are working on.
-Barbara