[MacPorts] #67412: gcc12 @12.3.0_0+stdlib_flag on MacOS Catalina: libiberty/objalloc.c:198:42: error: unknown type name 'PTR'

[MacPorts]

#67412: gcc12 @12.3.0_0+stdlib_flag on MacOS Catalina: libiberty/objalloc.c:198:42:
error: unknown type name 'PTR'
---------------------+--------------------
  Reporter:  dbl001  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.8.1
Resolution:          |   Keywords:
      Port:  gcc12   |
---------------------+--------------------

Comment (by dbl001):

 I am trying to migrate from MacOS 13 to MacOS 14.  gcc12 does not build.
 Many of my ports depend upon gcc12 (R, Octave, fftw, hdf5, etc.) which
 does not build.
 This was working on MacOS 13. Suggestions?

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Ticket URL: <https://trac.macports.org/ticket/67412#comment:14>
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