Package async_unix

Failed to find a solution:

no platform:
2024-05-29 14:58.59 [INFO] Solving for ocaml-base-compiler, ocaml,
                           async_unix using opam_repository_commit 7311123dcaba6b163a96ad2219b8cc4e59df93a3

2024-05-29 14:59.04 [INFO] base: eliminated all possibilities in 2.83 s

2024-05-29 14:59.04 [INFO] = base =

2024-05-29 14:59.04 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base camlp-streams.5.0.1 camlp4.5.1
          dune.3.15.3 ocaml-config.3 ocaml-options-vanilla.1
          ocamlbuild.0.14.3 ocamlfind.1.9.6
          async_unix&ocaml&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler ocaml base-domains ocaml ocaml-base-compiler
- async_core -> async_core.108.07.00
    async_unix 108.07.00 requires = 108.07.00
- async_unix -> async_unix.108.07.00
    User requested = 108.07.00
- core -> (problem)
    async_core 108.07.00 requires = 108.07.00
    Rejected candidates:
      core.v0.17.1: Incompatible with restriction: = 108.07.00
      core.v0.17.0: Incompatible with restriction: = 108.07.00
      core.v0.16.2: Incompatible with restriction: = 108.07.00
      core.v0.16.1: Incompatible with restriction: = 108.07.00
      core.v0.16.0: Incompatible with restriction: = 108.07.00
      ...
- ocaml -> ocaml.5.1.1
    User requested <= 5.1.1
- ocaml-base-compiler -> ocaml-base-compiler.5.1.1
    User requested >= 4.04.1
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.1.1~ & < 5.1.2~