[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
-------------------------------------+----------------------
  Reporter:  kencu                   |      Owner:  kencu
      Type:  enhancement             |     Status:  assigned
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:
      Port:  libcxx macports-libcxx  |
-------------------------------------+----------------------

Comment (by kencu):

 The headers are patched, and work properly in other ports (all the other
 ones tried):

 <https://github.com/macports/macports-ports/blob/master/lang/macports-
 libcxx/files/patch-disable-availabilty.diff>

 please show me exactly what you did in mame.

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:36>
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