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

[MacPorts]

#59113: gcc: 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:  gcc7 gcc8 gcc9  |
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Comment (by mouse07410):

 I won't speak my mind about what Apple did here, but nothing short of
 expletives could adequately convey the feelings. Note, that it's just one
 item in the list of things that Apple screwed up in Xcode-10 and made even
 worse in Xcode-11.

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Ticket URL: <https://trac.macports.org/ticket/59113#comment:25>
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