[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 jmroot):

 Replying to [comment:8 Ionic]:
 > > There's one problem. I have Xcode-10.3 installed with CLT, but it did
 not install include files into /use/include.
 >
 > Uh, that sounds really, really odd. Not having /usr/include would
 essentially make CLT useless. Xcode bundles SDKs anyway which include the
 command line tools, but a standalone CLT package without the proper header
 files would defeat the whole point of this exercise.

 That's actually normal with Xcode 10+. MacPorts has been able to use the
 SDK installed by the CLTs for some time.

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Ticket URL: <https://trac.macports.org/ticket/58779#comment:11>
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