[MacPorts] #41237: selfupdate 2.2.0 -> 2.2.1 failing

[MacPorts]

#41237: selfupdate 2.2.0 -> 2.2.1 failing
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  Reporter:  jacco@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.2.1
Resolution:           |   Keywords:
      Port:           |
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Comment (by cal@…):

 `/usr/lib/tclConfig.sh` is missing. It should be provided by the command
 line tools. Please run `xcode-select --install` and ensure the file I
 mentioned was installed.

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Ticket URL: <https://trac.macports.org/ticket/41237#comment:1>
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