[MacPorts] #63460: cmake-3.21.2_0 fails to configure on mavericks

[MacPorts]

#63460: cmake-3.21.2_0 fails to configure on mavericks
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  Reporter:  tehcog  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.7.1
Resolution:          |   Keywords:
      Port:  cmake   |
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Comment (by kencu):

 looks like that clang is unhappy with the new code.

 can you try blacklisting your clang to fallback to clang-3.7?

 btw I changed clang-5.0 to build with cmake-bootstrap, so we have that as
 a backup to build cmake too I hope.

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Ticket URL: <https://trac.macports.org/ticket/63460#comment:1>
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