[MacPorts] #59113: gcc8: cannot find systems headers with Xcode 11

[MacPorts]

#59113: gcc8: cannot find systems headers with Xcode 11
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  Reporter:  abyrvalk  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gcc8      |
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Comment (by mouse07410):

 Ken, thanks. Understood. Thankfully, my Macports is still able to use gcc8
 binaries (did not have to rebuild it locally after the Xcode upgrade). I
 hope the fix gets percolated downstream fast though.

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Ticket URL: <https://trac.macports.org/ticket/59113#comment:10>
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