Package cryptokit

Failed to find a solution:

no platform:
2024-05-29 14:58.34 [INFO] Solving for ocaml-base-compiler, ocaml,
                           cryptokit using opam_repository_commit 7311123dcaba6b163a96ad2219b8cc4e59df93a3

2024-05-29 14:58.41 [INFO] base: eliminated all possibilities in 3.20 s

2024-05-29 14:58.41 [INFO] = base =

2024-05-29 14:58.41 [INFO] Can't find all required versions.
Selected: base-num.base base-ocamlbuild.base num.0 ocaml-config.3
          ocamlfind.1.9.6 cryptokit&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler
- cryptokit -> cryptokit.1.6
    User requested = 1.6
- ocaml -> ocaml.4.02.4
    User requested <= 5.1.1
    base-num base requires < 4.06.0
    base-ocamlbuild base requires >= 3.10 & < 4.03
- 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
      ...
- ocamlbuild -> ocamlbuild.0
    cryptokit 1.6 requires <> 0.9.0