[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:  reneeotten
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gnuplot     |
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Comment (by mouse07410):

 Funny. What made the difference was **uninstalling** the gnuplot port
 altogether.

 {{{sudo port uninstall gnuplot; sudo port clean --all gnuplot; sudo port
 install gnuplot +qt5 -qt}}}

 Successful installation.

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Ticket URL: <https://trac.macports.org/ticket/62021#comment:9>
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