[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 kprussing):

 FYI, I just managed to build this port.  I opened Xcode and clicked to
 install the additional tools (along with running `xcode-select` and
 installing the command line tools) and it worked.  This could be a red
 herring…

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Ticket URL: <https://trac.macports.org/ticket/58776#comment:15>
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