Package ppx_tools

Failed to find a solution:

no platform:
2024-06-03 08:55.37 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ppx_tools using opam_repository_commit 4e03b5779a616b359a49721086d24092d8deef5c

2024-06-03 08:56.53 [INFO] base: eliminated all possibilities in 1.29 s

2024-06-03 08:56.53 [INFO] = base =

2024-06-03 08:56.53 [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 ppx_tools&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler ocaml base-domains
          ocaml-base-compiler
- 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~
- ppx_tools -> (problem)
    User requested = 0.1
    No usable implementations:
      ppx_tools.6.6: Rejected by user-specified constraint ppx_tools (= 0.1)
      ppx_tools.6.5: Rejected by user-specified constraint ppx_tools (= 0.1)
      ppx_tools.6.4: Rejected by user-specified constraint ppx_tools (= 0.1)
      ppx_tools.6.3: Rejected by user-specified constraint ppx_tools (= 0.1)
      ppx_tools.6.2: Rejected by user-specified constraint ppx_tools (= 0.1)
      ...