/usr/lib/x86_64-linux-gnu/libTKSTEPBase.so is in liboce-modeling-dev 0.15-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libTKSTEPBase.so.8
/usr/lib/x86_64-linux-gnu/libTKSTEPBase.so.8