[MacPorts] #62597: opencv4: Fails to build on 10.15 caused by rgbd submodule

[MacPorts]

#62597: opencv4: Fails to build on 10.15 caused by rgbd submodule
---------------------------------+--------------------
  Reporter:  essandess           |      Owner:  (none)
      Type:  defect              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.6.4
Resolution:                      |   Keywords:
      Port:  opencv4 py-opencv4  |
---------------------------------+--------------------

Comment (by mascguy):

 Also, it looks like binaries exist for 10.15. Are you attempting to build
 from source?

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Ticket URL: <https://trac.macports.org/ticket/62597#comment:6>
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