[MacPorts] #40715: parmetis: Add OpenMPI support

[MacPorts]

#40715: parmetis: Add OpenMPI support
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  Reporter:  jcverle@…    |      Owner:  ryandesign@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:  haspatch
      Port:  parmetis     |
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Comment (by ryandesign@…):

 Committed with changes in r112014. Variant are evaluated after the rest of
 the portfile, so to be able to change the compiler in a variant you can't
 use the compiler variables until the pre-configure phase.

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Ticket URL: <https://trac.macports.org/ticket/40715#comment:2>
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