Package ocaml-variants

Failed to find a solution:

no platform:
2024-06-06 16:59.19 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ocaml-variants using opam_repository_commit 940717b3216805deb851c1f20cbaf0f365f40895

2024-06-06 17:00.34 [INFO] base: eliminated all possibilities in 1.20 s

2024-06-06 17:00.34 [INFO] = base =

2024-06-06 17:00.34 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-threads.base base-unix.base
          host-arch-x86_64.1 ocaml-config.3
          ocaml-variants&ocaml&ocaml-base-compiler system-mingw
          system-mingw|system-msvc host-arch-x86_64 ocaml-base-compiler
          ocaml-base-compiler
- ocaml -> ocaml.4.13.1
    User requested <= 5.1.1
    ocaml-variants 4.13.1+options requires = 4.13.1
- 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.4.13.1+options
    User requested = 4.13.1+options
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied