[MacPorts] #34404: octave fails to build

[MacPorts]

#34404: octave fails to build
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 Reporter:  ryusuke.numata@…          |       Owner:  macports-tickets@…                   
     Type:  defect                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  2.0.4                                
 Keywords:                            |        Port:  octave                               
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 Octave fails to build because of missing the MPI library.
 I guess this is because my hdf5-18 is installed with +mpich2. A solution
 may be adding mpich2 (and also openmpi) variant where an appropriate MPI
 capable c++ compiler is set, like the attached patch file.

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Ticket URL: <https://trac.macports.org/ticket/34404>
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