[MacPorts] #42872: cmake PortGroup: don't add -I${prefix}/include to CXXFLAGS

[MacPorts]

#42872: cmake PortGroup: don't add -I${prefix}/include to CXXFLAGS
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  clhep    |
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Comment (by cal@…):

 r118762 is another instance of this. Can we please get the offending line
 removed ASAP? `CMAKE_SYSTEM_PREFIX_PATH` should already be enough to
 specify the required includes.

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Ticket URL: <https://trac.macports.org/ticket/42872#comment:14>
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