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

[MacPorts]

#56366: protobuf3-cpp fails to compile on OSX 10.8
----------------------------+------------------------------------
  Reporter:  letaage        |      Owner:  blair@…
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.2
Resolution:  fixed          |   Keywords:  mountainlion legacy-os
      Port:  protobuf3-cpp  |
----------------------------+------------------------------------

Comment (by kencu):

 Mmmm. Not perfect, unfortunately. On a couple of systems, the port builds
 through all the way with `macports-clang-5.0`, but at the very end, links
 with `/usr/bin/clang` which of course does not understand `-stdlib
 =macports-libstdc++` and so fails. So now that will have to be looked
 into...

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Ticket URL: <https://trac.macports.org/ticket/56366#comment:20>
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