/usr/share/man/man6/freeciv-gtk3.6.gz is in freeciv-client-gtk3 2.5.10-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man6/freeciv-client.6.gz
/usr/share/man/man6/freeciv-client.6.gz