[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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Comment (by kencu):

 So the next step would appear to be to try building some (hopefully
 simpler) ports, and try adding flags like this:
 {{{
 configure.cppflags-append -D_LIBCPP_DISABLE_AVAILABILITY
 configure.ldflags-append -L/opt/local/libexec/llvm-11/lib/
 -Wl,-rpath,/opt/local/libexec/llvm-11/lib/
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62426#comment:8>
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