[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):

 > Please explain why you think opencv3 requires llvm-9.0 and clang-9.0.

 Because it demanded to install both of them. Which I did not want, but had
 to concede. ;-)
 My machines usually run the latest Macports release of llvm and clang (and
 gcc), plus maybe an older version that is required for a specific reason
 (happens rarely).


 > What error did you see?

 No error - just an unnecessary (for me ;) installation of two huge
 packages (llvm-9.0 and clang-9.0) that I need to remove afterwards anyway.

 This ticket is about getting opencv3 to stop pulling and installing
 llvm-9.0 and clang-9.0 - or documenting that they are required for build-
 from-source (and in that case - upgrading the "dependency" to llvm-13 and
 clang-13).

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Ticket URL: <https://trac.macports.org/ticket/64353#comment:2>
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