/usr/share/man/man1/pat2dat.1.gz is in liballegro4-dev 2:4.4.2-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/allegro-dev-tools.1.gz
/usr/share/man/man1/allegro-dev-tools.1.gz