[MacPorts] #64276: macports will not build ports with Xcode 13.2.1

[MacPorts]

#64276: macports will not build ports with Xcode 13.2.1
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  Reporter:  AgilentGCMS  |      Owner:  (none)
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  gperf        |
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Comment (by AgilentGCMS):

 Replying to [comment:5 jmroot]:
 > Replying to [comment:1 AgilentGCMS]:
 > > I do have an SDK installed,
 >
 > But that's a macOS 12 SDK, so that doesn't mean the error message is
 incorrect. You need to have
 `/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk`. I would suggest
 trying the steps in ProblemHotlist#reinstall-clt.

 Well yes, but isn't it odd that macports is looking specifically for macos
 11 SDK? Is that hard-coded somewhere?

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Ticket URL: <https://trac.macports.org/ticket/64276#comment:8>
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