[MacPorts] #49033: mongo-cxx-driver @1.0.5 Add a cxx11 variant

[MacPorts]

#49033: mongo-cxx-driver @1.0.5 Add a cxx11 variant
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  Reporter:  julien.pilet@…    |      Owner:  macports-tickets@…
      Type:  enhancement       |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.3
Resolution:                    |   Keywords:
      Port:  mongo-cxx-driver  |
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Comment (by julien.pilet@…):

 Actually my patch does not work, and I do not know why. When I add
 --c++11=on to the list of build args, it works. With build.args-append and
 port install mongo-cxx-driver +cxx11, it does not.

 Is my syntax correct?

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Ticket URL: <https://trac.macports.org/ticket/49033#comment:1>
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