Package async_core

Failed to find a solution:

no platform:
2024-01-29 15:03.39 [INFO] Solving for ocaml-base-compiler, ocaml,
                           async_core using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 15:03.45 [INFO] base: eliminated all possibilities in 2.68 s

2024-01-29 15:03.45 [INFO] = base =

2024-01-29 15:03.45 [INFO] Can't find all required versions.
Selected: base-bytes.base base-ocamlbuild.base
          camlp4.4.02.0-1modular-implicits conf-which.1 ocaml-config.3
          ocamlbuild.0 ocamlfind.1.9.6 ounit.2.2.7 res.4.0.7
          async_core&ocaml&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler
- async_core -> async_core.109.36.00
    User requested = 109.36.00
- bin_prot -> bin_prot.109.30.00
    async_core 109.36.00 requires = 109.30.00
- comparelib -> comparelib.109.27.00
    core 109.36.00 requires = 109.27.00
- core -> core.109.36.00
    async_core 109.36.00 requires = 109.36.00
- core_kernel -> (problem)
    core 109.36.00 requires = 109.36.00
    Rejected candidates:
      core_kernel.v0.16.0: Incompatible with restriction: = 109.36.00
      core_kernel.v0.15.0: Incompatible with restriction: = 109.36.00
      core_kernel.v0.14.2: Incompatible with restriction: = 109.36.00
      core_kernel.v0.14.1: Incompatible with restriction: = 109.36.00
      core_kernel.v0.14.0: Incompatible with restriction: = 109.36.00
      ...
- custom_printf -> (problem)
    core 109.36.00 requires = 109.27.00
    Rejected candidates:
      custom_printf.113.00.00: Incompatible with restriction: = 109.27.00
      custom_printf.112.24.00: Incompatible with restriction: = 109.27.00
      custom_printf.112.17.00: Incompatible with restriction: = 109.27.00
      custom_printf.112.06.00: Incompatible with restriction: = 109.27.00
      custom_printf.112.01.00: Incompatible with restriction: = 109.27.00
      ...
- fieldslib -> fieldslib.109.20.00
    async_core 109.36.00 requires = 109.20.00
- herelib -> herelib.109.35.00
    async_core 109.36.00 requires = 109.35.00
- ocaml -> ocaml.4.02.4
    User requested <= 5.1.0
    async_core 109.36.00 requires >= 4.00.0 & < 4.03
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      ocaml-base-compiler.5.1.1: Requires ocaml = 5.1.1
      ocaml-base-compiler.5.1.1~rc1: Requires ocaml = 5.1.1
      ocaml-base-compiler.5.1.0: Requires ocaml = 5.1.0
      ocaml-base-compiler.5.1.0~rc3: Requires ocaml = 5.1.0
      ocaml-base-compiler.5.1.0~rc2: Requires ocaml = 5.1.0
      ...
- ocaml-variants -> (problem)
    camlp4 4.02.0-1modular-implicits requires = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
    Rejected candidates:
      ocaml-variants.5.3.0+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.2.0+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.2+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.1+tsan: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.1+options: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ...
- ounit2 -> (problem)
    ounit 2.2.7 requires = 2.2.7
    Rejected candidates:
      ounit2.2.2.7: Requires ocaml >= 4.04.0
      ounit2.2.2.6: Incompatible with restriction: = 2.2.7
      ounit2.2.2.5: Incompatible with restriction: = 2.2.7
      ounit2.2.2.4: Incompatible with restriction: = 2.2.7
      ounit2.2.2.3: Incompatible with restriction: = 2.2.7
      ...
- pa_ounit -> pa_ounit.109.36.00
    async_core 109.36.00 requires = 109.36.00
- pipebang -> pipebang.109.28.00
    core 109.36.00 requires = 109.28.00
- sexplib -> sexplib.109.20.00
    async_core 109.36.00 requires = 109.20.00
- type_conv -> type_conv.109.28.00
    bin_prot 109.30.00 requires >= 109.15.00 & <= 109.28.00
- variantslib -> variantslib.109.15.00
    core 109.36.00 requires = 109.15.00