[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 wlipa):

 Thanks.  I wound up downloading the Xcode 12.2 command line tools from
 Apple's developer site.  Running that installer solved the problem.

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Ticket URL: <https://trac.macports.org/ticket/61458#comment:5>
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