[MacPorts] #55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system

[MacPorts]

#55382: cmake @3.10.0: Cannot find a C++ compiler supporting C++11 on this system
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger leopard snowleopard lion
      Port:  cmake       |  mountainlion
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Comment (by kencu):

 Lucky. All those system libraries, none are c++.

 However, right now cmake is using an internal copy of `jsoncpp`. That port
 links against the standardlib, so if Michael ever changes it to use
 MacPorts jsoncpp, then the setup would break.

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Ticket URL: <https://trac.macports.org/ticket/55382#comment:49>
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