[MacPorts] #59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK on 10.14

[MacPorts]

#59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK on 10.14
----------------------+--------------------
  Reporter:  gverm    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.1
Resolution:           |   Keywords:
      Port:  libgcc9  |
----------------------+--------------------

Comment (by hemmlj):

 MacPorts upgrade on MacOs 12 Monterey:
 See Ticket https://trac.macports.org/ticket/64372 for help on this issue:
 Tipp there is  "install gcc11 or gcc-devel". You will have to force
 deactivate and clean some dependent libraries when cleaning your system
 from libgcc and libgcc10. I selected to install gcc-devel. Hope that
 helps!

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Ticket URL: <https://trac.macports.org/ticket/59340#comment:5>
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