[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:  High      |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  mojave
      Port:  root6     |
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Comment (by hansgans):

 I was aware the `xcode-select --install` is necessary. But nowhere is
 mentioned that installing `macOS_SDK_headers_for_macOS_10.14.pkg` is
 mandatory since mojave. Should this probably be mentioned in the MacPorts
 installation instructions?

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Ticket URL: <https://trac.macports.org/ticket/57403#comment:4>
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