[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 ryandesign):

 Replying to [comment:6 kencu]:
 > Just because his original post said he was on 10.12.6 already ... `wget
 doesn't build on 10.12(.6) Sierra`

 And then he said it's 10.12 16A323. 10.12.6 would be 16G29.

 > and I don't think the App Store would install Xcode 9 on an incompatible
 system. But I could be wrong there.

 I also think that, but it could have been installed by downloading from
 the Apple developer site or by copying the app from another computer.

 If updating to 10.12.6 doesn't fix it, verify that you've selected your
 Xcode using `xcode-select`.

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Ticket URL: <https://trac.macports.org/ticket/55057#comment:7>
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