[MacPorts] #64562: "libgcc9 cannot be built while libunwind-headers is active." when migrating from Big Sur to Monterey

[MacPorts]

#64562: "libgcc9 cannot be built while libunwind-headers is active." when migrating
from Big Sur to Monterey
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  Reporter:  MarkCallow  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:              |
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Comment (by MarkCallow):

 > Try manually removing libunwind-headers from myports.txt, if it is
 listed there, then run the restore script again.

 It was there. I removed it but I still get the same number of these
 errors.

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Ticket URL: <https://trac.macports.org/ticket/64562#comment:4>
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