[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
---------------------------------+----------------------------
  Reporter:  dbl001              |      Owner:  michaelld
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:  MacPorts 2.6.0
 Component:  ports               |    Version:  2.5.4
Resolution:                      |   Keywords:  cmake
      Port:  cmake, cmake-devel  |
---------------------------------+----------------------------

Comment (by mf2k):

 The Milestone field is for use by Macports team members only, please do
 not set it.

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Ticket URL: <https://trac.macports.org/ticket/58199#comment:8>
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