Package ocaml-variants

Failed to find a solution:

no platform:
2025-04-23 13:27.54 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ocaml-variants using opam_repository_commit 8106bcf57fc33218275bbf0d02e725f4e9fcd0f6

2025-04-23 13:28.38 [INFO] base: eliminated all possibilities in 0.45 s

2025-04-23 13:28.38 [INFO] = base =

2025-04-23 13:28.38 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-effects.base
          base-nnp.base base-threads.base base-unix.base host-arch-x86_64.1
          ocaml-compiler.5.4 ocaml-variants&ocaml&ocaml-base-compiler
          system-mingw system-mingw|system-msvc&winpthreads host-arch-x86_64
          base-domains ocaml ocaml
- ocaml -> (problem)
    User requested <= 5.1.1
    ocaml-compiler 5.4 requires = 5.4.0
    Rejected candidates:
      ocaml.5.1.1: Incompatible with restriction: = 5.4.0
      ocaml.5.1.0: Incompatible with restriction: = 5.4.0
      ocaml.5.0.1: Incompatible with restriction: = 5.4.0
      ocaml.5.0.0: Incompatible with restriction: = 5.4.0
      ocaml.4.14.3: Incompatible with restriction: = 5.4.0
      ...
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    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.5.4.0+trunk
    User requested = 5.4.0+trunk
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied