[MacPorts] #61701: clang-11 build fails on 10.9 with CMake Error:

[MacPorts]

#61701: clang-11 build fails on 10.9 with CMake Error:
-------------------------+-----------------------------
  Reporter:  cave-canem  |      Owner:  jeremyhu, kencu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  clang-11    |
-------------------------+-----------------------------

Comment (by kencu):

 thanks. clang-11 fails on all darwins < 10.12.

 This is an upstream design choice, but I think I can keep it all going
 back to 10.5 with acceptable effort...there are a couple of issues that
 will need repair.

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Ticket URL: <https://trac.macports.org/ticket/61701#comment:2>
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