[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):

 Something is going sideways with cmake for some users, apparently. Please
 attach the files (running {{{sh -c 'open `port dir
 eigen3`/work/build/CMakeFiles'}}} should open their containing directory
 for you) CMakeError.log and CMakeOutput.log and we'll start there.

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Ticket URL: <https://trac.macports.org/ticket/54365#comment:19>
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