[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:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:             |
------------------------+--------------------

Comment (by nikgervae):

 Output of `sudo port -d selfupdate` attached. It looks like the build
 system is trying to use the SDK for 10.14, even though I am running 10.13,
 and can't find the architecture i386.

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Ticket URL: <https://trac.macports.org/ticket/60062#comment:4>
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