Package riak

Failed to find a solution:

no platform:
2025-05-16 17:43.40 [INFO] Solving for ocaml-base-compiler,
                           riak, constraints ocaml-base-compiler<=5.3.0,
                           riak=1.0.0 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 17:43.42 [INFO] base: eliminated all possibilities in 0.81 s

2025-05-16 17:43.42 [INFO] = base =

2025-05-16 17:43.42 [INFO] Can't find all required versions.
Selected: base-bytes.base base-threads.base base-unix.base base64.3.5.1
          cppo.1.8.0 csexp.1.5.2 dune.3.18.2 dune-configurator.3.18.2
          easy-format.1.3.4 lwt.5.9.1 ocaml.5.5.0 ocaml-config.3
          ocaml-options-vanilla.1 ocamlbuild.0.16.1 ocamlfind.1.9.8
          ocplib-endian.1.2 ounit.2.2.7 ounit2.2.2.7 piqi.0.7.8
          piqilib.0.6.16 seq.base stdlib-shims.0.3.0 topkg.1.0.8 xmlm.1.4.0
          riak&ocaml-base-compiler ocaml-variants ocaml-base-compiler
          ocaml-base-compiler
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested <= 5.3.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.3.0 requires = 5.3.0
    Rejected candidates:
      ocaml-compiler.5.5: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.4: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0: Requires ocaml = 5.3.0
      ocaml-compiler.5.3.0~rc1: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~beta2: Incompatible with restriction: = 5.3.0
      ...
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+BER: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- riak -> riak.1.0.0
    User requested = 1.0.0
- riak-pb -> (problem)
    Rejected candidates:
      riak-pb.1.0.0: Requires piqi < 0.7.0
- sedlex -> (problem)
    piqilib 0.6.16 requires >= 2.0 & < 3.0
    Rejected candidates:
      sedlex.3.4: Incompatible with restriction: >= 2.0 & < 3.0
      sedlex.3.3: Incompatible with restriction: >= 2.0 & < 3.0
      sedlex.3.2: Incompatible with restriction: >= 2.0 & < 3.0
      sedlex.3.1: Incompatible with restriction: >= 2.0 & < 3.0
      sedlex.3.0: Incompatible with restriction: >= 2.0 & < 3.0
      ...