/usr/lib/x86_64-linux-gnu/libgts-0.7.so is in libgts-dev 0.7.6+darcs121130-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgts-0.7.so.5.0.1
/usr/lib/x86_64-linux-gnu/libgts-0.7.so.5.0.1