[MacPorts] #68189: opencv4 @4.6.0_12 +contrib +eigen +java +nonfree +opencl +openmp +qt5 +tbb +vtk fails to build on MacOS 10.15

[MacPorts]

#68189: opencv4 @4.6.0_12 +contrib +eigen +java +nonfree +opencl +openmp +qt5 +tbb
+vtk fails to build on MacOS 10.15
----------------------+----------------------
  Reporter:  Gandoon  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  opencv4  |
----------------------+----------------------
Changes (by mascguy):

 * status:  new => assigned
 * owner:  (none) => mascguy


Comment:

 That particular combination of variants - apart from `openmp` - is what I
 have installed everywhere. (Including 10.15.)

 I'll take a look.

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Ticket URL: <https://trac.macports.org/ticket/68189#comment:1>
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