[MacPorts] #55057: gmp doesn't build on Sierra: configure: error: could not find a working compiler

[MacPorts]

#55057: gmp doesn't build on Sierra: configure: error: could not find a working
compiler
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  Reporter:  shapez0r  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:  sierra
      Port:  gmp       |
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Comment (by shapez0r):

 yes, it's 10.12 16A323 with xcode 9 9A235

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Ticket URL: <https://trac.macports.org/ticket/55057#comment:3>
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