/usr/share/doc/libflac-ocaml-dev/changelog.Debian.gz is in libflac-ocaml-dev 0.1.1-4build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libflac-ocaml-dev/../libflac-ocaml/changelog.Debian.gz