Package base-effects

Failed to find a solution:

no platform:
2024-11-26 14:06.48 [INFO] Solving for ocaml-base-compiler, ocaml,
                           base-effects using opam_repository_commit 3d52b66b04788999a23f22f0d59c2dfc831c4f32

2024-11-26 14:06.50 [INFO] base: eliminated all possibilities in 0.78 s

2024-11-26 14:06.50 [INFO] = base =

2024-11-26 14:06.50 [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
          base-effects&ocaml&ocaml-base-compiler ocaml-variants system-mingw
          host-arch-x86_64 ocaml base-domains
- base-effects -> base-effects.base
    User requested = base
- ocaml -> (problem)
    User requested <= 5.0.0
    ocaml-variants 5.1.1+effect-syntax requires = 5.1.1
    Rejected candidates:
      ocaml.5.0.0: Incompatible with restriction: = 5.1.1
      ocaml.4.14.3: Incompatible with restriction: = 5.1.1
      ocaml.4.14.2: Incompatible with restriction: = 5.1.1
      ocaml.4.14.1: Incompatible with restriction: = 5.1.1
      ocaml.4.14.0: Incompatible with restriction: = 5.1.1
      ...
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      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-base-compiler.5.2.1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.1~rc1: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ocaml-base-compiler.5.2.0: In same conflict class (ocaml-core-compiler) as ocaml-variants
      ...
- ocaml-variants -> ocaml-variants.5.1.1+effect-syntax
    ocaml-variants|ocaml ocaml-variants requires = 4.12.0+domains+effects | = 5.1.1+effect-syntax
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied