[MacPorts] #55005: GMP fails to build on Sierra with Xcode 9.0

[MacPorts]

#55005: GMP fails to build on Sierra with Xcode 9.0
--------------------------+---------------------------------
  Reporter:  lucaspettey  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:               |   Keywords:
      Port:  gmp          |
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Changes (by mf2k):

 * owner:   => MarcusCalhoun-Lopez
 * status:  new => assigned


Comment:

 In the future, please use WikiFormatting and Cc the port maintainers
 ({{{port info --maintainers gmp}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/55005#comment:1>
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