Package ocaml-compiler

Failed to find a solution:

no platform:
2026-02-26 14:46.35 [INFO] Solving for ocaml-base-compiler,
                           ocaml-compiler, constraints ocaml-base-compiler<=5.4.0,
                           ocaml-compiler=5.5.0~alpha1 using opam_repository_commit 5119fbb0776fa3cd71b09f40a51e40f783c539bf

2026-02-26 14:47.03 [INFO] base: eliminated all possibilities in 0.21 s

2026-02-26 14:47.03 [INFO] = base =

2026-02-26 14:47.03 [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
          compiler-cloning.enabled ocaml-compiler&ocaml-base-compiler
          system-mingw system-mingw|system-msvc ocaml-base-compiler ocaml
          base-domains ocaml-variants
- ocaml -> ocaml.5.5.0
    ocaml-compiler 5.5.0~alpha1 requires = 5.5.0
- ocaml-base-compiler -> (problem)
    User requested <= 5.4.0
    Rejected candidates:
      ocaml-base-compiler.5.4.0: Requires ocaml-compiler = 5.4.0
      ocaml-base-compiler.5.4.0~rc1: Requires ocaml-compiler = 5.4.0~rc1
      ocaml-base-compiler.5.4.0~beta2: Requires ocaml-compiler = 5.4.0~beta2
      ocaml-base-compiler.5.4.0~beta1: Requires ocaml-compiler = 5.4.0~beta1
      ocaml-base-compiler.5.4.0~alpha1: Requires ocaml-compiler = 5.4.0~alpha1
      ...
- ocaml-compiler -> ocaml-compiler.5.5.0~alpha1
    User requested = 5.5.0~alpha1
- ocaml-variants -> (problem)
    ocaml-variants|ocaml ocaml-variants requires = 4.12.0+domains+effects | = 5.1.1+effect-syntax
    Rejected candidates:
      ocaml-variants.5.6.0+trunk: Requires ocaml-compiler = 5.6
      ocaml-variants.5.5.0+trunk: Requires ocaml-compiler = 5.5
      ocaml-variants.5.5.0~alpha1+options: Incompatible with restriction: = 4.12.0+domains+effects | = 5.1.1+effect-syntax
      ocaml-variants.5.4.2+trunk: Requires ocaml-compiler = 5.4
      ocaml-variants.5.4.1+options: Requires ocaml-compiler = 5.4.1
      ...
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied