[MacPorts] #65512: libgcc9 not available on Darwin 18 i386

[MacPorts]

#65512: libgcc9 not available on Darwin 18 i386
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  Reporter:  efji     |      Owner:  (none)
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  wontfix  |   Keywords:
      Port:  gcc9     |
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Comment (by efji):

 Thanks again Chris! I have done a bunch of uninstall/install, including
 octave and gmsh, and everything is ok now with gcc12. Some programs still
 use libgcc10 and libgcc11 but it is not a problem.

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Ticket URL: <https://trac.macports.org/ticket/65512#comment:9>
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