[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 essandess):

 Replying to [comment:6 mascguy]:
 > Also, it looks like binaries exist for 10.15. Are you attempting to
 install from source?

 Whoops, yes. I was doing a {{{port -s install py39-pytorch}}} to avoid the
 {{{@rpath}}} issue and the {{{opencv4}}} update went along for the ride.

 The binary install works for me, thank you.

 This is with:

 {{{
 macOS 10.15.7 19H524
 Xcode 12.4 12D4e
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62597#comment:7>
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