[MacPorts] #56366: protobuf3-cpp fails to compile on OSX 10.8

[MacPorts]

#56366: protobuf3-cpp fails to compile on OSX 10.8
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  Reporter:  letaage        |      Owner:  blair@…
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.2
Resolution:                 |   Keywords:  mountainlion legacy-os
      Port:  protobuf3-cpp  |
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Comment (by kencu):

 Yeah - that should have put the -stdlib=libc++ on the link line, but it
 didn't. This port uses some things like "LDFLAGS_FOR_BUILD" that may need
 to be looked into a bit. Sorry it wasn't dead easy.

 The other somewhat hacky way to do it is to add it onto the CXX compiler
 spec. Let me try a few things.

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Ticket URL: <https://trac.macports.org/ticket/56366#comment:13>
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