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

[MacPorts]

#62021: gnuplot-5.4.1 fails to upgrade if +qt5 speficied
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  Reporter:  mouse07410  |      Owner:  reneeotten
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gnuplot     |
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Comment (by reneeotten):

 are you sure that you did a selfupdate and cleaned the port first; in the
 log you added the {{{-std=c++11}}} is not present in the {{{CXXFLAGS}}}.
 In my case it is, so that suggests you missed one of these steps.

 Please do {{{sudo port selfupdate ; sudo port clean --all gnuplot ; sudo
 port upgrade gnuplot}}}.

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Ticket URL: <https://trac.macports.org/ticket/62021#comment:5>
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