/usr/lib/x86_64-linux-gnu/libsylph.so is in libsylph-dev 1.1.0-15.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsylph.so.1.1.0
/usr/lib/x86_64-linux-gnu/libsylph.so.1.1.0