[MacPorts] #66422: failing to install gnuplot 5.4.3 apparently bc of llvm-3.7

[MacPorts]

#66422: failing to install gnuplot 5.4.3 apparently bc of llvm-3.7
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  Reporter:  natelsonoptics  |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gnuplot         |
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Comment (by kencu):

 llvm-3.7 will most likely never be installable for arm64.

 The trick here is to figure out why it is being called in, and stop that.

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Ticket URL: <https://trac.macports.org/ticket/66422#comment:2>
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