[MacPorts] #61456: Cannot install gcc10 on Big Sur

[MacPorts]

#61456: Cannot install gcc10 on Big Sur
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 Reporter:  OliverUrbann  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.4
 Keywords:                |       Port:  gcc10
--------------------------+--------------------
 Installation of both gcc9 and gcc10 fail. It seems that installation of
 libgcc10-10.2.0_1.darwin_20.x86_64.tbz2 fails as they cannot be found
 (404).

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Ticket URL: <https://trac.macports.org/ticket/61456>
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