[MacPorts] #60062: port 2.5.4: Error: Unable to open port: invalid command name "compiler.cxx_standard"

[MacPorts]

#60062: port 2.5.4: Error: Unable to open port: invalid command name
"compiler.cxx_standard"
------------------------+--------------------
  Reporter:  nikgervae  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:             |
------------------------+--------------------

Comment (by jmroot):

 Although come to think of it, normally the CLTs should install
 /usr/include on 10.13, and if that exists, an SDK shouldn't be used at
 all.

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Ticket URL: <https://trac.macports.org/ticket/60062#comment:10>
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