[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 vertreko@…):

 Replying to [comment:21 dstrubbe@…]:
 > Ok, glad to hear that succeeded. Would you mind trying out +accelerate
 also with the reordered {{{configure.args-append}}} above too, to check
 whether that fix works?
 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.

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Ticket URL: <https://trac.macports.org/ticket/39476#comment:22>
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