Recently (#8102), libjpeg-turbo started building libraries to lib64 instead of lib on my machine.

I believe this is the culprit (in opencv's package.py):

        if '+jpeg' in spec:
            libjpeg = spec['jpeg']
            args.extend([
                '-DBUILD_JPEG:BOOL=OFF',
                '-DJPEG_LIBRARY:FILEPATH={0}'.format(
                    join_path(libjpeg.prefix.lib,
                              'libjpeg.{0}'.format(dso_suffix))),
                '-DJPEG_INCLUDE_DIR:PATH={0}'.format(libjpeg.prefix.include)
            ])

This does not consider the possibility that the path should be libjpeg.prefix.lib64.

I'm currently manually symlinking lib64/libjpeg.so to lib/libjpeg.so, as a stopgap.

• Does libjpeg.prefix.lib64 exist, in the context above? Can it? Should it?
• Is there some way to get libjpeg-turbo to install to lib instead of lib64? None of the changes in libjpeg-turbo stood out as the reason it changed directories.