/usr/lib/GNUstep/Bundles/libgnustep-xlib-026.bundle/libgnustep-back-026 is in gnustep-back0.26-xlib 0.26.2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/Bundles/libgnustep-xlib-026.bundle/libgnustep-xlib-026