[MacPorts] #60139: Guile 3 is out

[MacPorts]

#60139: Guile 3 is out
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  Reporter:  casouri  |      Owner:  (none)
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.2
Resolution:           |   Keywords:
      Port:  guile    |
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Comment (by szhorvat):

 @mf2k, what would be the procedure here? Perhaps rename the current port
 to `guile22` and let `guile` be version 3.0? Note that there is already a
 `guile18` port and it should be possible to have several versions
 installed concurrently.

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Ticket URL: <https://trac.macports.org/ticket/60139#comment:3>
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