[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 wlipa):

 Thanks, looks like those don't agree.  Is there a recommended way to
 reinstall the command line tools?


 {{{
 $ ls -l /Library/Developer/CommandLineTools/SDKs
 total 0
 lrwxr-xr-x  1 root  wheel   15 Jan 14  2020 MacOSX.sdk -> MacOSX10.15.sdk
 drwxr-xr-x  7 root  wheel  224 Jan 14  2020 MacOSX10.14.sdk
 drwxr-xr-x  8 root  wheel  256 Jan 14  2020 MacOSX10.15.sdk

 $ ls -l
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
 total 0
 drwxr-xr-x  5 root  wheel  160 Oct 19 13:33 DriverKit20.0.sdk
 drwxr-xr-x  7 root  wheel  224 Nov 13 08:32 MacOSX.sdk
 lrwxr-xr-x  1 root  wheel   10 Nov 13 08:28 MacOSX11.0.sdk -> MacOSX.sdk
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61458#comment:3>
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