[MacPorts] #61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS 11.0 Big Sur

[MacPorts]

#61494: gcc9 @9.3.0 "Failed to build libgcc9: command execution failed" in macOS
11.0 Big Sur
---------------------------+---------------------------------
  Reporter:  kgerheiser    |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:  gcc9 libgcc9 bigsur
      Port:  gcc9 libgcc9  |
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Changes (by kgerheiser):

 * Attachment "main.log" added.

 Build log

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Ticket URL: <https://trac.macports.org/ticket/61494>
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