[MacPorts] #58821: cmake, clang-8.0: circular dependency on older systems

[MacPorts]

#58821: cmake, clang-8.0: circular dependency on older systems
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  Reporter:  jmroot           |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.5.99
Resolution:                   |   Keywords:  libcxx
      Port:  cmake clang-8.0  |
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Comment (by michaelld):

 Yup please do!

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Ticket URL: <https://trac.macports.org/ticket/58821#comment:2>
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