[MacPorts] #67576: Error Building libgcc11 on MacOS Catalina: error: unknown type name 'PTR'

[MacPorts]

#67576: Error Building libgcc11 on MacOS Catalina: error: unknown type name 'PTR'
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  Reporter:  dbl001    |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.8.1
Resolution:            |   Keywords:
      Port:  libgcc11  |
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Comment (by Gandoon):

 I have a feeling that this might be related to #67412 as libgcc12 and
 gcc12 also fails to build on Catalina.

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Ticket URL: <https://trac.macports.org/ticket/67576#comment:1>
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