[MacPorts] #57612: clang does not respect -syslibroot when linking

[MacPorts]

#57612: clang does not respect -syslibroot when linking
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 Replying to [comment:10 kencu]:
 > we compile that, and a default isysroot is helpfully added, to the 10.14
 SDK, as you would expect:

 Where does that default isysroot come from? Because on 10.13, which has
 /usr/include, there is no default isysroot. It's only there on 10.14. But
 I don't know what puts it there.

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Ticket URL: <https://trac.macports.org/ticket/57612#comment:14>
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