[MacPorts] #58779: base: ports cannot use SDK inside of Developer dir unless using Xcode build type

[MacPorts]

#58779: base: ports cannot use SDK inside of Developer dir unless using Xcode build
type
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  Reporter:  Ionic   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.5.99
Resolution:          |   Keywords:  tracemode
      Port:          |
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Comment (by mouse07410):

 There's one problem. I have Xcode-10.3 installed with CLT, but it did not
 install include files into /use/include.

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Ticket URL: <https://trac.macports.org/ticket/58779#comment:7>
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