Package ocaml-variants

Failed to find a solution:

no platform:
2025-05-16 17:59.47 [INFO] Solving for ocaml-base-compiler,
                           ocaml-variants, constraints ocaml-base-compiler<=5.3.0,
                           ocaml-variants=4.04.1+fPIC using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 17:59.48 [INFO] base: eliminated all possibilities in 0.47 s

2025-05-16 17:59.48 [INFO] = base =

2025-05-16 17:59.48 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-threads.base base-unix.base ocaml-config.3
          ocaml-variants&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler
- ocaml -> ocaml.4.04.1
    ocaml-variants 4.04.1+fPIC requires = 4.04.1
- ocaml-base-compiler -> (problem)
    User requested <= 5.3.0
    Rejected candidates:
      ocaml-base-compiler.5.3.0: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.3.0~rc1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.3.0~beta2: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.3.0~beta1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.3.0~alpha1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ...
- ocaml-variants -> ocaml-variants.4.04.1+fPIC
    User requested = 4.04.1+fPIC