[MacPorts] #66671: llvm-15 @15.0.6 Failure to install on High Sierra

[MacPorts]

#66671: llvm-15 @15.0.6 Failure to install on High Sierra
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  Reporter:  EllipticEllipsis  |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.8.0
Resolution:                    |   Keywords:
      Port:  llvm-15           |
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Comment (by kencu):

 I think, at first glance, we might need to make libtapi build with
 clang11-bootstrap on 10.13 as well as the current 10.12 and less.

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Ticket URL: <https://trac.macports.org/ticket/66671#comment:2>
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