[MacPorts] #59837: macOS 10.14 SDK does not appear to be installed even though Command Line Tools are installed

[MacPorts]

#59837: macOS 10.14 SDK does not appear to be installed even though Command Line
Tools are installed
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  Reporter:  manulcaux  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:
Resolution:             |   Keywords:
      Port:             |
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Comment (by jmroot):

 No, definitely do not rename the 10.15 SDK. Using the wrong SDK can cause
 problems, which is why the warning is printed in the first place.

 It's normal for Xcode 11 to only provide a 10.15 SDK, but the 10.14 SDK
 should then be provided by the Command Line Tools and be in
 `/Library/Developer/CommandLineTools/SDKs`. I don't know why that is not
 the case for you.

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Ticket URL: <https://trac.macports.org/ticket/59837#comment:7>
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