/usr/lib/libBioCocoa.so is in libbiococoa-dev 2.2.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/Frameworks/BioCocoa.framework/Versions/Current/libBioCocoa.so
/usr/lib/GNUstep/Frameworks/BioCocoa.framework/Versions/Current/libBioCocoa.so