[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:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.2
Resolution:                 |   Keywords:  yosemite legacy-os
      Port:  protobuf3-cpp  |
----------------------------+--------------------------------

Comment (by kencu):

 it looks like it is trying to build and link against libc++, and those
 errors look like the ones you see when you try to link against the wrong
 stdlib. Have you set your default stdlib to libc++ yourself in
 macports.conf?

 By default it should be building against gcc's libstdc++ courtesy of the
 cxx11 1.1 PG.

 If you haven't changed it, then the build script could be setting it by
 itself, which would be the wrong stdlib for 10.8.

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Ticket URL: <https://trac.macports.org/ticket/56366#comment:3>
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