[MacPorts] #55153: armadillo @8.200.1 +arpack: 'mpi.h' file not found

[MacPorts]

#55153: armadillo @8.200.1 +arpack: 'mpi.h' file not found
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  Reporter:  majoc-at-astro  |      Owner:  Schamschula
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.4.2
Resolution:                  |   Keywords:
      Port:  armadillo       |
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Comment (by jjstickel):

 I just got hit with this. Also see #57045 for the same problem with gdal.
 However, gdal has an openmpi variant; armadillo does not.

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Ticket URL: <https://trac.macports.org/ticket/55153#comment:9>
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