[MacPorts] #48826: gnuplot: build failure with lua 5.3

[MacPorts]

#48826: gnuplot: build failure with lua 5.3
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  Reporter:  rbsrg@…  |      Owner:  mojca@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  gnuplot  |
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Comment (by si.chen@…):

 Replying to [comment:8 ryandesign@…]:
 > Has duplicate #48856.

 Sorry for the duplication, I didn't mean to. I red Ticket #48826 and had
 already tried everything I could find here yesterday before creating a new
 ticket today. It seems that the problem of Ticket #48826 has been solved,
 but it still doesn't work for me, could you please explain a little more,
 what should I do now to make gnuplot compiled correctly ? Thank you in
 advance for your help.

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Ticket URL: <https://trac.macports.org/ticket/48826#comment:10>
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