[MacPorts] #39975: root: Add --enable-cxx11 when using libc++

[MacPorts]

#39975: root: Add --enable-cxx11 when using libc++
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  Reporter:  jfcaron@…    |      Owner:  jeremyhu@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:  fixed        |   Keywords:
      Port:  root         |
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Comment (by jeremyhu@…):

 buildfromsource is required because you are using a non-default C++
 runtime.

 delete_la_files is reccomended because you're rebuilding everything
 anyways.

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Ticket URL: <https://trac.macports.org/ticket/39975#comment:33>
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