[MacPorts] #64353: opencv3 has undocumented dependencies

[MacPorts]

#64353: opencv3 has undocumented dependencies
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  Reporter:  mouse07410  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  opencv3     |
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Comment (by mouse07410):

 > FYI, @jmroot has updated MacPorts' overall Clang selection logic, to
 prefer newer MacPorts-provided versions

 I understood this as "updated selection logic to pick the newest-
 acceptable version from what's installed, if none is available - install
 the newest acceptable".

 > Changing ports' dependencies based on what you happen to already have
 installed is inherently non-reproducible, so it's not something we want to
 start doing

 I'm not sure I understand. What then is the "logic to prefer newer
 versions..."? And since clang-13 is "newer" than clang-12 - why was it not
 "preferred", especially since it was even installed?

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Ticket URL: <https://trac.macports.org/ticket/64353#comment:20>
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