[MacPorts] #65542: mpich-default 4.0.2: Failed to build mpich-default on Macbook Pro osx 10.13.6

[MacPorts]

#65542: mpich-default 4.0.2: Failed to build mpich-default on Macbook Pro osx
10.13.6
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  Reporter:  Tom-Bertin            |      Owner:  mascguy
      Type:  defect                |     Status:  assigned
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.7.2
Resolution:                        |   Keywords:
      Port:  mpich-default octave  |
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Comment (by mascguy):

 Given that MacPorts can't identify the Xcode version, you'll want to
 reinstall the Xcode CLT:

 https://trac.macports.org/wiki/ProblemHotlist#reinstall-clt

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Ticket URL: <https://trac.macports.org/ticket/65542#comment:7>
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