[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 eborisch):

 It built just fine on the buildbots and on my sierra system. Try in
 sandbox mode?

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Ticket URL: <https://trac.macports.org/ticket/54365#comment:11>
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