[MacPorts] #66655: qt5-qtlocation 5.15.8 fails to build

[MacPorts]

#66655: qt5-qtlocation 5.15.8 fails to build
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  Reporter:  jsalort         |      Owner:  MarcusCalhoun-Lopez
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.8.0
Resolution:                  |   Keywords:
      Port:  qt5-qtlocation  |
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Comment (by MarcusCalhoun-Lopez):

 Since mapbox-gl-native is in in a 3rdparty directory in the source tree,
 it is possible some other port installed it as well.\\
 If two header files have the same name, the build might be improperly
 including the wrong one.

 Is, e.g., a file named `symbol_layer_properties.hpp` in
 [https://guide.macports.org/chunked/reference.variables.html prefix] or
 [https://trac.macports.org/wiki/FAQ#usrlocal /usr/local]?

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Ticket URL: <https://trac.macports.org/ticket/66655#comment:5>
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