/usr/lib/x86_64-linux-gnu/libgecodegist.so is in libgecode-dev 3.7.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgecodegist.so.32.0
/usr/lib/x86_64-linux-gnu/libgecodegist.so.32.0