/usr/share/man/man1/s390x-linux-gnu-gnatgcc.1.gz is in gnat-6-s390x-linux-gnu 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/s390x-linux-gnu-gcc-6.1.gz
/usr/share/man/man1/s390x-linux-gnu-gcc-6.1.gz