[MacPorts] #55641: zmq @4.2.3 fails to build on 10.7 and 10.8 due to C++11

[MacPorts]

#55641: zmq @4.2.3 fails to build on 10.7 and 10.8 due to C++11
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  Reporter:  ryandesign      |      Owner:  merijn
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.4.2
Resolution:                  |   Keywords:  lion, mountainlion
      Port:  zmq, zmq-devel  |
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Comment (by michaelld):

 Unless someone objects, I'm going to commit this fix later today, mid-
 afternoon in US/ET (so ~5 hours from now). I think it's a robust fix that
 allows us to enable/disable C++11 dynamically -- which is desirable. I'll
 push it upstream as well.

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Ticket URL: <https://trac.macports.org/ticket/55641#comment:18>
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