[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
---------------------+--------------------
  Reporter:  wlipa   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:          |
---------------------+--------------------

Comment (by mseri):

 Also in my case the versions were not matching.
 The following fixed it (for me):

 {{{
 $ sudo rm -rf /Library/Developer/CommandLineTools
 $ xcode-select --install
 }}}

 It installed the new Command Line Tools and everything started working
 fine.

-- 
Ticket URL: <https://trac.macports.org/ticket/61458#comment:4>
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