[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
-----------------------------+--------------------------------
  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  |
-----------------------------+--------------------------------

Comment (by ryandesign):

 It appears that C++11 support in zmq and zmq-devel is optional. If a
 C++11-supporting compiler is not found, it seems to happily build with
 C++11 support disabled. This is what currently happens on 10.6 and
 earlier.

 If we change that, it will increase the dependencies for 10.6 and earlier,
 and might even make the ports fail to build on those systems; I have not
 tested that but recall the difficulties we had with cmake. And if it
 succeeds, the build would be different than before, which would
 necessitate increasing the revision.

 I was trying to provide a minimal fix for the 10.7 and 10.8 build failure
 that would not adversely affect 10.6 and earlier.

--
Ticket URL: <https://trac.macports.org/ticket/55641#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS