[MacPorts] #64507: install-dependencies failed with an unlikely error

[MacPorts]

#64507: install-dependencies failed with an unlikely error
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by jmroot):

 Yep, Tcl "helpfully" adds `${prefix}/lib` to `auto_path` when the
 interpreter is executed as `${prefix}/bin/port-tclsh` (or indeed anything
 under `${prefix}/bin`). https://github.com/macports/macports-
 base/blob/master/vendor/tcl8.5.19/library/init.tcl#L55-L59

 This problem is avoided by port(1) because its interpreter is set to
 `${prefix}/libexec/macports/bin/tclsh8.5`.

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Ticket URL: <https://trac.macports.org/ticket/64507#comment:3>
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