[MacPorts] #68189: opencv4 @4.6.0 +contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk: build failure related to ceres-solver: cannot initialize a parameter of type 'LocalParameterization*' with an lvalue of type 'ceres::SubsetManifold*'

[MacPorts]

#68189: opencv4 @4.6.0 +contrib+eigen+java+nonfree+opencl+openmp+qt5+tbb+vtk: build
failure related to ceres-solver: cannot initialize a parameter of type
'LocalParameterization*' with an lvalue of type 'ceres::SubsetManifold*'
----------------------+----------------------
  Reporter:  Gandoon  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  opencv4  |
----------------------+----------------------

Comment (by mascguy):

 Based on the log, you have Xcode/CLT 12.4 installed. And that release
 ships with the macOS 11 SDK, rather than 10.15, which can definitely cause
 issues.

 The latest Xcode/CLT release with the 10.15 SDK, is 12.1. So I'd strongly
 recommend that you downgrade both the CLT and Xcode to that version,
 before going any further.

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Ticket URL: <https://trac.macports.org/ticket/68189#comment:3>
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