[MacPorts] #55317: gmsh won't build with xcode 9.1

[MacPorts]

#55317: gmsh won't build with xcode 9.1
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  Reporter:  dershow  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  xcode9
      Port:  gmsh     |
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Comment (by ryandesign):

 Could you attach the main.log, please?

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Ticket URL: <https://trac.macports.org/ticket/55317#comment:2>
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