[MacPorts] #68871: btop broken on Catalina and below

[MacPorts]

#68871: btop broken on Catalina and below
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  samasaur1
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  catalina, mojave, highsierra,
                         |  sierra, elcapitan, yosemite, mavericks,
      Port:  btop        |  mountainlion, lion, snowleopard, leopard, tiger
-------------------------+-------------------------------------------------

Comment (by mascguy):

 Replying to [comment:1 barracuda156]:
 > Opened an issue: https://github.com/aristocratos/btop/issues/682

 Superficially, this *might* be fixable via the use of pg `legacy-support`
 with `use_mp_libcxx`, as done in umpteen other ports.

 I'll do some testing in older releases over the coming days, and report
 back. Stay tuned...

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Ticket URL: <https://trac.macports.org/ticket/68871#comment:5>
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