eio 0.4

Error log

The package failed to build. The error log from opam follows.

Opam plugin "depext" may require upgrading/reinstalling. Reinstall the plugin on the current switch? [Y/n] y
The following actions will be performed:
  - recompile opam-depext 1.2.3

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved opam-depext.1.2.3  (cached)
-> removed   opam-depext.1.2.3
-> installed opam-depext.1.2.3
Done.

<><> opam-depext.1.2.3 installed successfully <><><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# Run eval $(opam env) to update the current shell environment

<><> Carrying on to "opam depext -viy eio_linux.0.4 uring.0.9 topkg.1.0.7 seq.base psq.0.2.1 optint.0.3.0 ocamlfind.1.9.6 ocamlbuild.0.15.0 mtime.2.1.0 lwt-dllist.1.0.1 logs.0.7.0 hmap.0.8.1 fmt.0.9.0 eio.0.4 dune-configurator.3.16.0 dune.3.16.0 cstruct.6.2.0 csexp.1.5.2 bigstringaf.0.10.0" 

Since version 2.1, opam now handles external dependencies alongside OCaml ones, and the `depext` plugin interface is provided for backwards compatibility only. Consider using your usual `opam install` command to install both OCaml and system dependencies, or `opam install <pkg> --depext-only` if you want to only install external dependencies.
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
[ERROR] No solution for eio_linux.0.4 & uring.0.9 & topkg.1.0.7 & seq.base & psq.0.2.1 & optint.0.3.0 & ocamlfind.1.9.6 & ocamlbuild.0.15.0 & mtime.2.1.0 & lwt-dllist.1.0.1 & logs.0.7.0 & hmap.0.8.1 & fmt.0.9.0 & eio.0.4 & dune-configurator.3.16.0 & dune.3.16.0 & cstruct.6.2.0 & csexp.1.5.2 & bigstringaf.0.10.0:   * Incompatible packages:
            - (invariant) -> ocaml-base-compiler = 5.0.0
            - eio = 0.4
            You can temporarily relax the switch invariant with `--update-invariant'


Command failed: opam --cli=2.1 list --readonly --external '--resolve=eio_linux.0.4,uring.0.9,topkg.1.0.7,seq.base,psq.0.2.1,optint.0.3.0,ocamlfind.1.9.6,ocamlbuild.0.15.0,mtime.2.1.0,lwt-dllist.1.0.1,logs.0.7.0,hmap.0.8.1,fmt.0.9.0,eio.0.4,dune-configurator.3.16.0,dune.3.16.0,cstruct.6.2.0,csexp.1.5.2,bigstringaf.0.10.0' --color=never returned 20