Package metal

Failed to find a solution:

no platform:
2025-07-24 04:33.37 [INFO] Solving for ocaml-base-compiler,
                           metal, constraints ocaml-base-compiler<=5.3.0,
                           metal=0.1.1 using opam_repository_commit 6e2437f434aaefdbe4b6c39fafe2bf40b3fe9479

2025-07-24 04:33.38 [INFO] base: eliminated all possibilities in 0.21 s

2025-07-24 04:33.38 [INFO] = base =

2025-07-24 04:33.38 [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 ocaml-config.3
          ocaml-options-vanilla.1 metal&ocaml-base-compiler system-mingw
          system-mingw|system-msvc&winpthreads ocaml-base-compiler
          ocaml-base-compiler ocaml base-domains ocaml-variants
          ocaml-base-compiler
- metal -> (problem)
    User requested = 0.1.1
    No usable implementations:
      metal.0.1.1: Availability condition not satisfied
- ocaml -> ocaml.5.3.0
    ocaml-compiler 5.3.0 requires = 5.3.0
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested <= 5.3.0
- ocaml-compiler -> ocaml-compiler.5.3.0
    ocaml-base-compiler 5.3.0 requires = 5.3.0
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0~alpha1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied