[MacPorts] #59464: building gcc 9 fails

[MacPorts]

#59464: building gcc 9 fails
----------------------+--------------------
 Reporter:  lplatter  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.6.1
 Keywords:  gcc       |       Port:  gcc9
----------------------+--------------------
 building with

 sudo port -v -s install gcc9

 fails

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Ticket URL: <https://trac.macports.org/ticket/59464>
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