[MacPorts] #66202: Build failed because "fatal error: 'mpi.h' file not found"

[MacPorts]

#66202: Build failed because "fatal error: 'mpi.h' file not found"
-------------------------+-----------------------
 Reporter:  astroboylrx  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.8.0
 Keywords:               |       Port:  py39-h5py
-------------------------+-----------------------
 Cannot install `py39-h5py` and also other `-h5py` ports because the build
 process cannot find `mpi.h`. I also cannot find a way to add extra
 header/lib path. Setting environment variables `CFLAGS` and `LDFLAGS` do
 not have effects.

 install `py39-h5py +openmpi` also fails.

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Ticket URL: <https://trac.macports.org/ticket/66202>
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