[MacPorts] #53187: gr-osmosdr fails to build on OSX 10.7.5

[MacPorts]

#53187: gr-osmosdr fails to build on OSX 10.7.5
-------------------------+-------------------
  Reporter:  nr0q        |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.5
Resolution:              |   Keywords:
      Port:  gr-osmosdr  |
-------------------------+-------------------

Comment (by kencu):

 fails finding `type_traits`, which is a c++11 feature. So it appears that
 this will likely need to be in the cxx11 portgroup -- which complicates
 life a bit for you on 10.7 unless you've upgraded to LibcxxOnOlderSystems.

 For a quick try-out, you might just try running a build line something
 like this:
 {{{
 sudo port -v install gr-osmosdr configure.cflags-append="-stdlib=libc++"
 configure.cxxflags-append="-stdlib=libc++" configure.ldflags-
 append="-stdlib=libc++" cxx_stdlib="libc++"
 }}}

 If I'm correct, this should install it as a one-off to see if this will
 work or not. If it does, you'll know LibcxxOnOlderSystems is worth doing.

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Ticket URL: <https://trac.macports.org/ticket/53187#comment:1>
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