[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 kencu):

 BTW, here is where `gcc` devs are working on this issue with the 10.15
 headers <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90835>

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Ticket URL: <https://trac.macports.org/ticket/59113#comment:12>
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