[MacPorts] #62124: gcc9 @9.3.0_4 gfortran fails with "ld: library not found for -lSystem" in Big Sur

[MacPorts]

#62124: gcc9 @9.3.0_4 gfortran fails with "ld: library not found for -lSystem" in
Big Sur
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  Reporter:  cquike     |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  gcc8 gcc9  |
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Comment (by mascguy):

 While not quite the same symptoms, could be a similar situation to
 issue:62070.

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Ticket URL: <https://trac.macports.org/ticket/62124#comment:3>
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