[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:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:
      Port:  root         |
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Comment (by jonesc@…):

 I've attached a second patch file, with Jeremy's suggestion (thanks).
 Please could you test ? Builds for me on OSX10.9.

 Chris

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Ticket URL: <https://trac.macports.org/ticket/39975#comment:17>
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