Package ocaml-variants

Failed to find a solution:

no platform:
2026-02-04 14:55.55 [INFO] Solving for ocaml-base-compiler,
                           ocaml-variants, constraints ocaml-base-compiler<=5.4.0,
                           ocaml-variants=5.1.1+flambda2 using opam_repository_commit 45c04602c2fc908af6d1b17ba39c7517d58cb274

2026-02-04 14:55.55 [INFO] base: eliminated all possibilities in 0.20 s

2026-02-04 14:55.55 [INFO] = base =

2026-02-04 14:55.55 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-flambda2.base base-threads.base
          base-unix.base conf-autoconf.0.2 dune-secondary.3.16.0
          ocaml-config.3 ocaml-secondary-compiler.4.14.2
          ocaml-variants&ocaml-base-compiler ocaml-base-compiler system-mingw
          system-mingw|system-msvc ocaml-base-compiler
- menhir-secondary -> menhir-secondary.20210419
    ocaml-variants 5.1.1+flambda2 requires = 20210419
- ocaml -> ocaml.5.1.1
    ocaml-variants 5.1.1+flambda2 requires = 5.1.1
- ocaml-base-compiler -> (problem)
    User requested <= 5.4.0
    Rejected candidates:
      ocaml-base-compiler.5.4.0: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.4.0~rc1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.4.0~beta2: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.4.0~beta1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.4.0~alpha1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ...
- ocaml-variants -> ocaml-variants.5.1.1+flambda2
    User requested = 5.1.1+flambda2
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied