[MacPorts] #57403: ROOT 6 compilation via cling fails

[MacPorts]

#57403: ROOT 6 compilation via cling fails
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  Reporter:  hansgans  |      Owner:  cjones051073
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  mojave
      Port:  root6     |
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Comment (by jmroot):

 A standard installation of the command line tools does not provide
 /usr/include on Mojave. You can't rely on it existing, and that extra
 package with the headers will likely go away at some point in the future.
 System headers are provided by the SDK.

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Ticket URL: <https://trac.macports.org/ticket/57403#comment:8>
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