[MacPorts] #58199: cmake: build failure on OSX 10.11 due to LegacySupport PortGroup

[MacPorts]

#58199: cmake: build failure on OSX 10.11 due to LegacySupport PortGroup
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  Reporter:  dbl001  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:
      Port:  cmake   |
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Comment (by cjones051073):

 b.t.w. Ken, it would be very useful if you could cook up some sort of test
 to add to the legacy support package for this issue, so we can test it
 there rather than via a MP make port, which is way more convoluted...

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Ticket URL: <https://trac.macports.org/ticket/58199#comment:15>
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