[MacPorts] #61883: libgcc7: build failure

[MacPorts]

#61883: libgcc7: build failure
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  Reporter:  YuncongMa  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  libgcc7    |
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Changes (by clegra):

 * Attachment "main.log.zip" added.

 build error libgcc7 on MacOS Big Sur (~60 MB, 1.7 MB zipped)

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Ticket URL: <https://trac.macports.org/ticket/61883>
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