Version 2.4.3 is available upstream. Please consider updating! It seems that version 2.4.3 is available upstream, while the latest version in the Gentoo tree is 2.4.2. You think this warning is false? Read more about it here.
Odoc_parser is a library for parsing the contents of OCaml
documentation comments, formatted using 'odoc' syntax, an extension
of the language understood by ocamldoc.