[MacPorts] #61458: fresh install on Big Sur emits warning about SDK not installed

[MacPorts]

#61458: fresh install on Big Sur emits warning about SDK not installed
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  Reporter:  wlipa   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 It works fine for us.

 Please verify that the path
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk
 exists. If it does not, reinstall Xcode 12.2.

 Please verify that the path
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk exists. If it does
 not, reinstall the Xcode 12.2 version of the command line tools.

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Ticket URL: <https://trac.macports.org/ticket/61458#comment:2>
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