New comment by ralsei on void-packages repository

https://github.com/void-linux/void-packages/pull/21063#issuecomment-615523840

Comment:
I'll look into cross-compiling and testing this myself. 4.2.x worked, presumably.

Also, no packages in the repos actually depend on `opencv4` -- they all depend on `opencv` (3.x). This decision was made because too much software requires 3.x.