[MacPorts] #67402: Can't build MacPorts on 10.11 with Xcode 8.2.1

[MacPorts]

#67402: Can't build MacPorts on 10.11 with Xcode 8.2.1
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  Reporter:  catap   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 If you're on 10.11, why is it building for 10.12?

 Do you have the `MACOSX_DEPLOYMENT_TARGET` environment variable set to
 `10.12`? That would explain it.

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Ticket URL: <https://trac.macports.org/ticket/67402#comment:3>
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