Version 3.6 is available upstream. Please consider updating! It seems that version 3.6 is available upstream, while the latest version in the Gentoo tree is 3.3-r1. You think this warning is false? Read more about it here.
sedlex is a lexer generator for OCaml. It is similar to ocamllex, but
supports Unicode. Unlike ocamllex, sedlex allows lexer specifications
within regular OCaml source files. Lexing specific constructs are provided
via a ppx syntax extension.