[MacPorts] #70440: libkml @1.3.0_4+debug+tests: error: C++ versions less than C++14 are not supported

[MacPorts]

#70440: libkml @1.3.0_4+debug+tests: error: C++ versions less than C++14 are not
supported
------------------------------+------------------------
  Reporter:  TheLastLovemark  |      Owner:  ryandesign
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.3
Resolution:                   |   Keywords:
      Port:  libkml           |
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Comment (by ryandesign):

 Of note, this should only happen when you use the tests variant, which is
 only of relevance if you want to run the tests. So while I should fix the
 tests variant, if you do not want to run the tests, don't use the tests
 variant.

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Ticket URL: <https://trac.macports.org/ticket/70440#comment:2>
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