[MacPorts] #65626: llvm-devel @20220731: build fails on < 10.10 due to lack of <pthread/qos.h>

[MacPorts]

#65626: llvm-devel @20220731: build fails on < 10.10 due to lack of <pthread/qos.h>
---------------------------------+--------------------------
  Reporter:  kencu               |      Owner:  cjones051073
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  llvm-devel llvm-15  |
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Comment (by kencu):

 this one looks fixable for older systems, but would require modest effort
 to ifdef around.

 I don’t know how easy it might be to add an implementation of this to
 older systems, using what they can provide to mimic <pthread/qos.h>. That
 effort might be generally more useful.

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Ticket URL: <https://trac.macports.org/ticket/65626#comment:4>
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