[MacPorts] #62021: gnuplot-5.4.1 fails to upgrade if +qt5 speficied

[MacPorts]

#62021: gnuplot-5.4.1 fails to upgrade if +qt5 speficied
-------------------------+--------------------
  Reporter:  mouse07410  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gnuplot     |
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Changes (by mouse07410):

 * Attachment "gnuplot.main.log.txt" added.

 main build log

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Ticket URL: <https://trac.macports.org/ticket/62021>
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