[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
-------------------------+--------------------
  Reporter:  MarkCallow  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:              |
-------------------------+--------------------
Changes (by MarkCallow):

 * Attachment "main.log" added.

 Log file mendtioned in the error message.

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