[MacPorts] #61500: llvm-9.0 Big Sur, fails with ./+CONTENTS not found in archive

[MacPorts]

#61500: llvm-9.0 Big Sur, fails with ./+CONTENTS not found in archive
-----------------------+--------------------
  Reporter:  mseri     |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur
      Port:  llvm-9.0  |
-----------------------+--------------------
Changes (by mseri):

 * Attachment "main.log" added.

 upgrade error log

-- 
Ticket URL: <https://trac.macports.org/ticket/61500>
MacPorts <https://www.macports.org/>
Ports system for macOS