[MacPorts] #61503: improve warning message when command line tools are out of date

[MacPorts]

#61503: improve warning message when command line tools are out of date
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  Reporter:  wlipa        |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.6.4
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 It's annoying that we have to work around this Apple bug.

 See ProblemHotlist#reinstall-clt

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Ticket URL: <https://trac.macports.org/ticket/61503#comment:2>
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