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

[MacPorts]

#61456: Cannot install gcc10 on Big Sur
---------------------------+--------------------
  Reporter:  OliverUrbann  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:
      Port:  gcc10         |
---------------------------+--------------------
Changes (by OliverUrbann):

 * Attachment "main.log.zip" added.

 Sorry for compression, log of build has 70 MB.

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