[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
-------------------------+-------------------------------------------------
  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  closed
  Priority:  High        |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  tiger leopard snowleopard lion
      Port:  cmake       |  mountainlion
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Comment (by ryandesign):

 Replying to [comment:59 thetrial]:
 > Now I have clang-3.4, 3.7, 3.8, 3.9, 4.0 and 5.0 and the corresponding
 llvm-3.4…5.0 on my system. So what is necessary and what could be
 uninstalled? Would it be right to set 5.0 requested and let the rest go?

 You can `sudo port uninstall leaves` to uninstall ports that you did not
 request and that are not needed. But MacPorts will reinstall them later if
 they are needed when you ask to install something else later.'

 Marking clang-5.0 (or any other port) as requested will have no effect on
 whether MacPorts needs to use that port to build another port, though it
 will remove it from the list of leaves.

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Ticket URL: <https://trac.macports.org/ticket/55382#comment:60>
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