/usr/lib/GNUstep/Bundles/libgnustep-cairo-024.bundle/libgnustep-back-024 is in gnustep-back0.24-cairo 0.24.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/Bundles/libgnustep-cairo-024.bundle/libgnustep-cairo-024