[MacPorts] #58776: macOS 10.15 libgcc9 fails to build with Xcode 11

[MacPorts]

#58776: macOS 10.15 libgcc9 fails to build with Xcode 11
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  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  libgcc9   |
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Comment (by vdoublie):

 When I reported the issue: Xcode was up to date with the additional tools
 AND the CLT (dmg) installed

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Ticket URL: <https://trac.macports.org/ticket/58776#comment:16>
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