[MacPorts] #62426: libc++: using a newer libc++ to build software on older macos systems

[MacPorts]

#62426: libc++: using a newer libc++ to build software on older macos systems
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  Reporter:  kencu        |      Owner:  kencu
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libcxx       |
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Changes (by kencu):

 * Attachment "Screen Shot 2021-03-14 at 12.58.15 PM.png" added.

 mkvtoolnix v55.0.0 running on 10.14 Mojave using libc++.dylib from
 clang-11 tree

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Ticket URL: <https://trac.macports.org/ticket/62426>
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