/usr/lib/x86_64-linux-gnu/libgsf-1.so is in libgsf-1-dev 1.14.36-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgsf-1.so.114.0.36
/usr/lib/x86_64-linux-gnu/libgsf-1.so.114.0.36