[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 jmroot):

 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.

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Ticket URL: <https://trac.macports.org/ticket/64353#comment:19>
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