Package extunix

Failed to find a solution:

no platform:
2024-09-12 08:07.27 [INFO] Solving for ocaml-base-compiler, ocaml,
                           extunix using opam_repository_commit 0329818dcfd3de1a722ea09eeeed94cd24caa375

2024-09-12 08:07.34 [INFO] base: eliminated all possibilities in 3.22 s

2024-09-12 08:07.34 [INFO] = base =

2024-09-12 08:07.34 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-unix.base camlp4.4.03+system ocaml-config.3
          ocamlbuild.0.14.3 ocamlfind.1.9.6 extunix&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler
- extunix -> extunix.0.1.3
    User requested = 0.1.3
- ocaml -> ocaml.4.03.1
    User requested <= 5.1.1
    camlp4 4.03+system requires >= 4.03 & < 4.04
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      ocaml-base-compiler.5.2.0: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~rc1: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~beta2: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~beta1: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~alpha1: Requires ocaml = 5.2.0
      ...
- ocaml-system -> (problem)
    No usable implementations:
      ocaml-system.5.2.0: Availability condition not satisfied
      ocaml-system.5.1.1: Availability condition not satisfied
      ocaml-system.5.1.0: Availability condition not satisfied
      ocaml-system.5.0.0: Availability condition not satisfied
      ocaml-system.4.14.2: Availability condition not satisfied
      ...