Package ocaml-variants

Failed to find a solution:

no platform:
2024-06-14 09:09.35 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ocaml-variants using opam_repository_commit 3dc372d9b20251c5e7b20f98e0935106c90247ad

2024-06-14 09:10.38 [INFO] base: eliminated all possibilities in 0.94 s

2024-06-14 09:10.38 [INFO] = base =

2024-06-14 09:10.38 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base host-arch-x86_64.1
          ocaml-variants&ocaml&ocaml-base-compiler system-msvc
          host-arch-x86_64 ocaml base-domains
- ocaml -> (problem)
    User requested <= 5.1.1
    ocaml-variants 5.2.0+msvc requires = 5.2.0
    Rejected candidates:
      ocaml.5.1.1: Incompatible with restriction: = 5.2.0
      ocaml.5.1.0: Incompatible with restriction: = 5.2.0
      ocaml.5.0.1: Incompatible with restriction: = 5.2.0
      ocaml.5.0.0: Incompatible with restriction: = 5.2.0
      ocaml.4.14.3: Incompatible with restriction: = 5.2.0
      ...
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      ocaml-base-compiler.5.2.0: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.0~rc1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.0~beta2: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.0~beta1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.0~alpha1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ...
- ocaml-variants -> ocaml-variants.5.2.0+msvc
    User requested = 5.2.0+msvc
- system-msvc -> (problem)
    No usable implementations:
      system-msvc.1: Availability condition not satisfied
- winpthreads -> (problem)
    No usable implementations:
      winpthreads.20240209-1: Availability condition not satisfied