[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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Comment (by Schamschula):

 I still don't understand what is going on here. Due to the nature of the
 {{{gnuplot}}} license, MacPorts cannot distribute the binary package.

 However the build bots can verify that the build succeeds: There was only
 one build failure for the latest version of gnuplot: MacOS X Lion (due to
 a build issue with the {{{openspecfun}}} dependency).

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Ticket URL: <https://trac.macports.org/ticket/72669#comment:11>
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