/usr/lib/x86_64-linux-gnu/libsxclient.so is in libsxclient-dev 2.0+ds-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsxclient.so.3.0.0
/usr/lib/x86_64-linux-gnu/libsxclient.so.3.0.0