Version 3.0 is available upstream. Please consider updating!
It seems that version 3.0 is available upstream, while the latest version in the Gentoo tree is 2.5. 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.