/usr/lib/x86_64-linux-gnu/libiec61883.so is in libiec61883-dev 1.2.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libiec61883.so.0.1.1
/usr/lib/x86_64-linux-gnu/libiec61883.so.0.1.1