Package async_core

Failed to find a solution:

no platform:
2024-05-29 15:00.13 [INFO] Solving for ocaml-base-compiler, ocaml,
                           async_core using opam_repository_commit 7311123dcaba6b163a96ad2219b8cc4e59df93a3

2024-05-29 15:00.19 [INFO] base: eliminated all possibilities in 2.79 s

2024-05-29 15:00.19 [INFO] = base =

2024-05-29 15:00.19 [INFO] Can't find all required versions.
Selected: base.v0.17.0 base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base bin_prot.v0.17.0
          camlp-streams.5.0.1 camlp4.5.1 csexp.1.5.2 dune.3.15.3
          dune-configurator.3.15.3 fieldslib.v0.17.0 num.1.5
          ocaml-compiler-libs.v0.12.4 ocaml-config.3 ocaml-options-vanilla.1
          ocaml_intrinsics_kernel.v0.17.0 ocamlbuild.0.14.3 ocamlfind.1.9.6
          ounit.2.2.7 ounit2.2.2.7 pa_ounit.112.24.00 parsexp.v0.17.0
          ppx_compare.v0.17.0 ppx_custom_printf.v0.17.0 ppx_derivers.1.2.1
          ppx_fields_conv.v0.17.0 ppx_optcomp.v0.17.0 ppx_sexp_conv.v0.17.0
          ppx_stable_witness.v0.17.0 ppx_variants_conv.v0.17.0 ppxlib.0.32.1
          ppxlib_jane.v0.17.0 seq.base sexplib.v0.17.0 sexplib0.v0.17.0
          stdio.v0.17.0 stdlib-shims.0.3.0 variantslib.v0.17.0
          async_core&ocaml&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler ocaml base-domains ocaml ocaml-base-compiler
- async_core -> async_core.108.00.01
    User requested = 108.00.01
- core -> (problem)
    async_core 108.00.01 requires = 108.00.01
    Rejected candidates:
      core.v0.17.1: Incompatible with restriction: = 108.00.01
      core.v0.17.0: Incompatible with restriction: = 108.00.01
      core.v0.16.2: Incompatible with restriction: = 108.00.01
      core.v0.16.1: Incompatible with restriction: = 108.00.01
      core.v0.16.0: Incompatible with restriction: = 108.00.01
      ...
- ocaml -> ocaml.5.1.1
    User requested <= 5.1.1
- ocaml-base-compiler -> ocaml-base-compiler.5.1.1
    User requested >= 4.04.1
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.1.1~ & < 5.1.2~
- type_conv -> (problem)
    pa_ounit 112.24.00 requires >= 109.53.00 & < 112.02.00
    Rejected candidates:
      type_conv.113.00.02: Incompatible with restriction: >= 109.53.00 & < 112.02.00
      type_conv.113.00.01: Incompatible with restriction: >= 109.53.00 & < 112.02.00
      type_conv.113.00.00: Incompatible with restriction: >= 109.53.00 & < 112.02.00
      type_conv.112.01.02: Requires ocaml >= 4.02.0 & < 4.03
      type_conv.112.01.01: Requires ocaml >= 4.02.0 & < 4.03
      ...