/usr/share/man/man1/ocamlviz-gui.1.gz is in ocamlviz 1.01-2build7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/ocamlviz.1.gz
/usr/share/man/man1/ocamlviz.1.gz