/usr/lib/x86_64-linux-gnu/librttopo.so is in librttopo-dev 1.0.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librttopo.so.1.0.0
/usr/lib/x86_64-linux-gnu/librttopo.so.1.0.0