/usr/lib/x86_64-linux-gnu/libTKXDESTEP.so is in liboce-ocaf-dev 0.18.2-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libTKXDESTEP.so.11
/usr/lib/x86_64-linux-gnu/libTKXDESTEP.so.11