[MacPorts] #41321: cmake: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)

[MacPorts]

#41321: cmake: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or
later)
---------------------------+-----------------------
  Reporter:  ryandesign@…  |      Owner:  css@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.99
Resolution:                |   Keywords:  mavericks
      Port:  cmake         |
---------------------------+-----------------------

Comment (by mojca@…):

 Personal reminder: test this patch also with ports using Fortran (root,
 plplot, ... #37732).

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Ticket URL: <https://trac.macports.org/ticket/41321#comment:17>
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