[MacPorts] #64353: opencv3 has undocumented dependencies

[MacPorts]

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

 * status:  new => assigned
 * cc: mascguy (removed)
 * owner:  (none) => mascguy


Comment:

 Please explain why you think opencv3 requires llvm-9.0 and clang-9.0. We
 have successful builds of this port on all 64-bit OS versions on our
 automated build system.

 What error did you see? If opencv3 failed to build, attach the main.log
 file.

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Ticket URL: <https://trac.macports.org/ticket/64353#comment:1>
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