[MacPorts] #57964: port diagnose: could not execute xcode-select, no such file or directory

[MacPorts]

#57964: port diagnose: could not execute xcode-select, no such file or directory
---------------------+--------------------
  Reporter:  dzhub   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.5.4
Resolution:          |   Keywords:  tiger
      Port:          |
---------------------+--------------------
Changes (by dzhub):

 * Attachment "main.log" added.

 main.log of broken build for readline

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Ticket URL: <https://trac.macports.org/ticket/57964>
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