[MacPorts] #58876: ncurses-bootstrap fails to build as dependency on system with working libcxx environment

[MacPorts]

#58876: ncurses-bootstrap fails to build as dependency on system with working
libcxx environment
--------------------------------+--------------------
  Reporter:  grumpybozo         |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.5.4
Resolution:                     |   Keywords:
      Port:  ncurses-bootstrap  |
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Comment (by jmroot):

 Ah, I see the problem - you have clang-8.0 installed already. That
 combined with the fact that compiler.fallback can't change dynamically in
 response to configure.cxx_stdlib changing (because it's set to a fixed
 value in macports.conf) causes the issue.

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Ticket URL: <https://trac.macports.org/ticket/58876#comment:12>
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