[MacPorts] #61908: opencv: @3.4.13: variant 'contrib' fails with link error, for module 'libopencv_sfm'

[MacPorts]

#61908: opencv: @3.4.13: variant 'contrib' fails with link error, for module
'libopencv_sfm'
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  opencv   |
----------------------+----------------------

Comment (by mascguy):

 Builds succeed on 10.12, 10.14, and 10.15. So it may be related to
 contrib-related dependencies are -- and/or aren't -- installed. So I'll
 take this.

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Ticket URL: <https://trac.macports.org/ticket/61908#comment:3>
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