[MacPorts] #63460: cmake-3.21.2_0 fails to configure on older Xcode clang versions

[MacPorts]

#63460: cmake-3.21.2_0 fails to configure on older Xcode clang versions
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  Reporter:  tehcog  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  High    |  Milestone:
 Component:  ports   |    Version:  2.7.1
Resolution:          |   Keywords:  lion mavericks
      Port:  cmake   |
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Comment (by michaelld):

 I'm booting up a MacOSX 10.9 system to work on this issue. Might take a
 couple days to get it to the point of being useful, but at least I'll have
 direct on metal (non-VM) functionality.

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Ticket URL: <https://trac.macports.org/ticket/63460#comment:14>
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