[MacPorts] #61396: rust @1.47.0: fails to build on Big Sur

[MacPorts]

#61396: rust @1.47.0: fails to build on Big Sur
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  Reporter:  5nefarious  |      Owner:  (none)
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.99
Resolution:  invalid     |   Keywords:  bigsur
      Port:  rust        |
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Comment (by 5nefarious):

 Replying to [comment:7 kencu]:
 For some reason, even running `port upgrade llvm-9.0`, it's still trying
 to build `qt5-qtbase`.

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Ticket URL: <https://trac.macports.org/ticket/61396#comment:8>
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