[MacPorts] #61510: llvm-9.0 failed to build on macOS 11.0 (Big Sur)

[MacPorts]

#61510: llvm-9.0 failed to build on macOS 11.0 (Big Sur)
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 Reporter:  moyang  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.4
 Keywords:          |       Port:  llvm-9.0
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 Log file is attached

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Ticket URL: <https://trac.macports.org/ticket/61510>
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