[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):

 Replying to [comment:28 michaelld]:
 > It's difficult to ignore the App Store's insistence that updates are
 available to Xcode & not do them ...

 I checked that. My vm 10.11 does Not offer me the update to xcode 8 in the
 app store.....

 >
 > One option in the cmake Portfile would be to check the OS & Xcode
 versions && if 10.11 && 8 then do not include the legacy PG.
 >
 > Chris: FYI I'm about to try out your legacy fix to see if it works.

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Ticket URL: <https://trac.macports.org/ticket/58199#comment:32>
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