[MacPorts] #56004: audacity @2.2.0: error: unknown type name 'unique_ptr'

[MacPorts]

#56004: audacity @2.2.0: error: unknown type name 'unique_ptr'
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  RJVB
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  audacity
------------------------+----------------------
 audacity 2.2.0 fails to build on Mountain Lion and earlier with:

 {{{
 ./MemoryX.h:398:27: error: unknown type name 'unique_ptr'
       using scalar_case = unique_ptr<X>;
                           ^
 }}}

 https://build.macports.org/builders/ports-10.8_x86_64_legacy-
 builder/builds/53666/steps/install-port/logs/stdio

 I expect this needs the cxx11 1.1 portgroup, but haven't tested it.

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Ticket URL: <https://trac.macports.org/ticket/56004>
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