/usr/lib/x86_64-linux-gnu/libsml.so is in libsml-dev 0.1.1+git20170608-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsml.so.1
/usr/lib/x86_64-linux-gnu/libsml.so.1