[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
------------------------+--------------------
  Reporter:  cquike     |      Owner:  (none)
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:  fixed      |   Keywords:  bigsur
      Port:  gcc8 gcc9  |
------------------------+--------------------
Changes (by kencu):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 I believe this has been fixed now by changes in base and the noted ports
 to spec an existing SDK.

 please reopen with new information if you find this is still and issue.

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Ticket URL: <https://trac.macports.org/ticket/62124#comment:11>
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