Package ppx_fields_conv

Failed to find a solution:

no platform:
2025-03-28 15:47.56 [INFO] Solving for ocaml-base-compiler, ocaml,
                           ppx_fields_conv using opam_repository_commit dabc6e3b0542d5b2ec8980ea98a74f9101a0d433

2025-03-28 15:48.35 [INFO] base: eliminated all possibilities in 0.53 s

2025-03-28 15:48.35 [INFO] = base =

2025-03-28 15:48.35 [INFO] Can't find all required versions.
Selected: base.v0.17.1 base-bigarray.base base-domains.base base-effects.base
          base-nnp.base base-threads.base base-unix.base csexp.1.5.2
          dune.3.17.2 dune-configurator.3.17.2 fieldslib.v0.17.0
          ocaml-compiler.5.3.0 ocaml-compiler-libs.v0.17.0
          ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1
          ppx_derivers.1.2.1 ppxlib.0.36.0 sexplib0.v0.17.0
          stdlib-shims.0.3.0 ppx_fields_conv&ocaml&ocaml-base-compiler
          system-mingw system-mingw|system-msvc&winpthreads ocaml
          base-domains ocaml-variants ocaml ocaml-base-compiler
- ocaml -> (problem)
    User requested <= 5.0.0
    base v0.17.1 requires >= 5.1.0
    Rejected candidates:
      ocaml.5.0.0: Incompatible with restriction: >= 5.1.0
      ocaml.4.14.3: Incompatible with restriction: >= 5.1.0
      ocaml.4.14.2: Incompatible with restriction: >= 5.1.0
      ocaml.4.14.1: Incompatible with restriction: >= 5.1.0
      ocaml.4.14.0: Incompatible with restriction: >= 5.1.0
      ...
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested >= 4.04.1
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.4.0+trunk: 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
      ocaml-variants.5.3.0~rc1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0~beta2+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- ppx_fields_conv -> ppx_fields_conv.v0.17.0
    User requested = v0.17.0
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied