[MacPorts] #39476: arpack's openmpi variant conflicts with gcc45

[MacPorts]

#39476: arpack's openmpi variant conflicts with gcc45
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  Reporter:  mk@…    |      Owner:  mmoll@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.1.3
Resolution:          |   Keywords:
      Port:  arpack  |
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Comment (by mmoll@…):

 Perhaps the ports should be changed so that *mpi and gcc* conflict with
 each other. The gcc*, if selected, can simply be ignored when one of the
 *mpi variants is selected. This would make for a more complex Portfile but
 a less confusing user experience.

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Ticket URL: <https://trac.macports.org/ticket/39476#comment:51>
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