/usr/lib/x86_64-linux-gnu/libafflib.so is in libafflib-dev 3.7.16-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libafflib.so.0.0.0
/usr/lib/x86_64-linux-gnu/libafflib.so.0.0.0