/usr/bin/s390x-linux-gnu-gnatxref is in gnat-6-s390x-linux-gnu 6.3.0-18cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/s390x-linux-gnu-gnatxref-6
/usr/bin/s390x-linux-gnu-gnatxref-6