[MacPorts] #67476: postgis3 @3.2.0_5+postgresql14+proj8+raster+topology: Dependency requires c++14 instead of 11 now.

[MacPorts]

#67476: postgis3 @3.2.0_5+postgresql14+proj8+raster+topology: Dependency requires
c++14 instead of 11 now.
----------------------------------+----------------------
  Reporter:  beporter             |      Owner:  Veence
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.8.1
Resolution:                       |   Keywords:
      Port:  postgis3 protobuf-c  |
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Comment (by ryandesign):

 The above mentioned commit simply uses `compiler.cxx_standard 2014` in the
 protobuf-c port. This tells MacPorts to pick a C++14-capable compiler when
 compiling protobuf-c. This ticket is about a build failure of the postgis3
 port so no, a change to the protobuf-c port won't fix that.

 Adding `compiler.cxx_standard 2014` to the postgis3 port may not be
 sufficient. It may also be necessary to add `configure.cxxflags-append
 -std=c++14`.

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Ticket URL: <https://trac.macports.org/ticket/67476#comment:8>
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