[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 larryv@…):

 Replying to [comment:22 vertreko@…]:
 > Is there a way to build a port variant if you don't want to
 > subsequently tag it as the "active" one?  I'm happy to try to build
 > arpack with the change but I don't want to mess up my installation.

 Use `port destroot` instead of `port install`, to perform all stages
 except the install and activate phases. You’ll have to manually run `port
 clean` afterwards, of course.

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Ticket URL: <https://trac.macports.org/ticket/39476#comment:23>
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