[MacPorts] #54365: eigen3 fails to configure on Sierra

[MacPorts]

#54365: eigen3 fails to configure on Sierra
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  Reporter:  TimArnold  |      Owner:  eborisch
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  eigen3     |
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Comment (by TimArnold):

 OK thanks \\ first time I've used this \\ many thanks for the help \\ I
 couldn't find a way to alter the cc field once ticket submitted

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Ticket URL: <https://trac.macports.org/ticket/54365#comment:10>
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