[MacPorts] #36176: plplot upgrade to rev 3 fails, claims clang not installed

[MacPorts]

#36176: plplot upgrade to rev 3 fails, claims clang not installed
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  Reporter:  david.w.watson@…  |      Owner:  takeshi@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.1.2
Resolution:                    |   Keywords:
      Port:  plplot            |
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Comment (by ryandesign@…):

 Could you please attach a clean log file so that we can begin to try to
 diagnose the problem?

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Ticket URL: <https://trac.macports.org/ticket/36176#comment:2>
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