/usr/lib/x86_64-linux-gnu/librelp.so is in librelp-dev 1.2.7-2+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librelp.so.0.1.0
/usr/lib/x86_64-linux-gnu/librelp.so.0.1.0