[MacPorts] #72669: gnuplot 6 install fails on macOS 13.7

[MacPorts]

#72669: gnuplot 6 install fails on macOS 13.7
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  Reporter:  pidloop  |      Owner:  Schamschula
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.10.7
Resolution:           |   Keywords:
      Port:  gnuplot  |
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Changes (by pidloop):

 * Attachment "main.log" added.

 log of sudo port install gnuplot

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Ticket URL: <https://trac.macports.org/ticket/72669>
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