[MacPorts] #61750: base prefers arch of terminal in use rather than machine arch when installing ports

[MacPorts]

#61750: base prefers arch of terminal in use rather than machine arch when
installing ports
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  Reporter:  raw-bin  |      Owner:  (none)
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  base     |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by kencu):

 That's pretty much exactly what we would have guessed the issue would be.

 We will need to override $platform somehow to return the native arch of
 the machine rather than the running arch of tcl, if we want this to work
 correctly for everyone now that fat is here to stay for a decade again...

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Ticket URL: <https://trac.macports.org/ticket/61750#comment:33>
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