[MacPorts] #58854: cmake @3.15.2 fails to configure on 10.6/libc++

[MacPorts]

#58854: cmake @3.15.2 fails to configure on 10.6/libc++
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 Reporter:  jmroot       |      Owner:  cjones051073
     Type:  defect       |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.5.99
 Keywords:  snowleopard  |       Port:  cmake legacy-support
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 Looks like it might be a problem introduced by legacy-support. See the
 attached logs.

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Ticket URL: <https://trac.macports.org/ticket/58854>
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