[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):

 > Our gcc versions were built against a versioned macOS SDK that no longer
 exists...

 I hope there's work in progress to change this to build against
 {{{/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/}}}?
 Which, coincidentally, is exactly what {{{xcrun --show-sdk-path}}}
 returns?

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Ticket URL: <https://trac.macports.org/ticket/59113#comment:4>
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