I've downloaded versions of OpenCV 4.1.2 a few days apart.
The earlier version has a cmake-gui option:
BUILD_opencv_python3:BOOL=ON
It is not present in today's version (2019 nov 04). It's not that
it's switched off--the option does not appear at all. I'm not
sure of its exact function (anyone?) but since it had defaulted
to ON in the previous download, it sounded significant.
Another new flag is present in today's build:
OPENCV_ENABLE_MEMALIGN:BOOL=ON
I'm not as concerned about that, but it does indicate that some
things have changed.
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