[MacPorts] #56616: flac: stdlibc++ mismatch

[MacPorts]

#56616: flac: stdlibc++ mismatch
---------------------+-------------------------
  Reporter:  iEFdev  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.2
Resolution:          |   Keywords:  cxx_stdlib,
      Port:  flac    |
---------------------+-------------------------

Comment (by ryandesign):

 Ken, we need a solution that does not involve users manually changing
 settings. In a near-future version of MacPorts, we want to migrate all
 users of 10.6-10.8 to libc++ by default, so we need base and portfiles to
 choose suitable compilers on their own.

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Ticket URL: <https://trac.macports.org/ticket/56616#comment:8>
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