[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:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  gnuplot     |
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Comment (by reneeotten):

 sorry, I thought that setting {{{compiler.cxx_standard       2011}}} would
 add the {{{-std=c++11}}} automatically and that's why I removed it from
 the Portfile. I added it back now and it works for me now - please try
 again.

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Ticket URL: <https://trac.macports.org/ticket/62021#comment:2>
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