[MacPorts] #69867: legacy-support headers should work with later SDK versions

[MacPorts]

#69867: legacy-support headers should work with later SDK versions
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  Reporter:  fhgwright       |      Owner:  fhgwright
      Type:  defect          |     Status:  assigned
  Priority:  Low             |  Milestone:
 Component:  ports           |    Version:  2.9.3
Resolution:                  |   Keywords:
      Port:  legacy-support  |
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Comment (by fhgwright):

 One thing that would help in testing this issue would be to teach the
 build procedure to honor `SDKROOT`.  Currently it doesn't.

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Ticket URL: <https://trac.macports.org/ticket/69867#comment:3>
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