Package ctypes

Failed to find a solution:

no platform:
2024-02-27 11:31.41 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ctypes using opam_repository_commit 7c22f971dbeddd8cfc3f690346dbf910d18b0c59

2024-02-27 11:34.17 [INFO] base: eliminated all possibilities in 2.11 s

2024-02-27 11:34.17 [INFO] = base =

2024-02-27 11:34.17 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base ocaml-config.3
          ocaml-options-vanilla.1 ctypes&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler ocaml base-domains
          ocaml-base-compiler
- ctypes -> (problem)
    User requested = 0.9.1
    No usable implementations:
      ctypes.0.22.0: Rejected by user-specified constraint ctypes (= 0.9.1)
      ctypes.0.21.1: Rejected by user-specified constraint ctypes (= 0.9.1)
      ctypes.0.20.2: Rejected by user-specified constraint ctypes (= 0.9.1)
      ctypes.0.20.1: Rejected by user-specified constraint ctypes (= 0.9.1)
      ctypes.0.20.0: Rejected by user-specified constraint ctypes (= 0.9.1)
      ...
- ocaml -> ocaml.5.1.0
    User requested <= 5.1.0
- ocaml-base-compiler -> ocaml-base-compiler.5.1.0
    User requested >= 4.04.1
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.1.0~ & < 5.1.1~