Package gen_server

Failed to find a solution:

no platform:
2024-09-12 08:30.24 [INFO] Solving for ocaml-base-compiler, ocaml,
                           gen_server using opam_repository_commit 0329818dcfd3de1a722ea09eeeed94cd24caa375

2024-09-12 08:30.31 [INFO] base: eliminated all possibilities in 3.50 s

2024-09-12 08:30.31 [INFO] = base =

2024-09-12 08:30.31 [INFO] Can't find all required versions.
Selected: base.v0.17.1 base-bigarray.base base-domains.base base-nnp.base
          base-threads.base base-unix.base base_bigstring.v0.17.0
          base_quickcheck.v0.17.0 bin_prot.v0.17.0 camlp-streams.5.0.1
          camlp4.5.1 capitalization.v0.17.0 core.v0.17.1 csexp.1.5.2
          dune.3.16.0 dune-configurator.3.16.0 fieldslib.v0.17.0 gel.v0.17.0
          host-arch-x86_64.1 int_repr.v0.17.0 jane-street-headers.v0.17.0
          jst-config.v0.17.0 num.1.5-1 ocaml-compiler-libs.v0.12.4
          ocaml-config.3 ocaml-options-vanilla.1
          ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.15.0 ocamlfind.1.9.6
          parsexp.v0.17.0 ppx_assert.v0.17.0 ppx_base.v0.17.0
          ppx_bench.v0.17.0 ppx_bin_prot.v0.17.0 ppx_cold.v0.17.0
          ppx_compare.v0.17.0 ppx_custom_printf.v0.17.0 ppx_derivers.1.2.1
          ppx_diff.v0.17.0 ppx_disable_unused_warnings.v0.17.0
          ppx_enumerate.v0.17.0 ppx_expect.v0.17.0 ppx_fields_conv.v0.17.0
          ppx_fixed_literal.v0.17.0 ppx_globalize.v0.17.0 ppx_hash.v0.17.0
          ppx_here.v0.17.0 ppx_ignore_instrumentation.v0.17.0
          ppx_inline_test.v0.17.0 ppx_jane.v0.17.0 ppx_let.v0.17.0
          ppx_log.v0.17.0 ppx_module_timer.v0.17.0 ppx_optcomp.v0.17.0
          ppx_optional.v0.17.0 ppx_pipebang.v0.17.0 ppx_sexp_conv.v0.17.0
          ppx_sexp_message.v0.17.0 ppx_sexp_value.v0.17.0 ppx_stable.v0.17.0
          ppx_stable_witness.v0.17.0 ppx_string.v0.17.0
          ppx_string_conv.v0.17.0 ppx_tydi.v0.17.0 ppx_typerep_conv.v0.17.0
          ppx_variants_conv.v0.17.0 ppxlib.0.33.0 ppxlib_jane.v0.17.0
          sexplib.v0.17.0 sexplib0.v0.17.0 splittable_random.v0.17.0
          stdio.v0.17.0 stdlib-shims.0.3.0 time_now.v0.17.0 typerep.v0.17.0
          variantslib.v0.17.0 gen_server&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler system-mingw ocaml
          base-domains ocaml ocaml-base-compiler
- async -> async.109.17.00
    gen_server 2.0.1 requires < v0.10
- async_core -> (problem)
    async 109.17.00 requires = 109.15.00
    Rejected candidates:
      async_core.109.55.02: Incompatible with restriction: = 109.15.00
      async_core.109.55.00: Incompatible with restriction: = 109.15.00
      async_core.109.53.00: Incompatible with restriction: = 109.15.00
      async_core.109.47.00: Incompatible with restriction: = 109.15.00
      async_core.109.45.00: Incompatible with restriction: = 109.15.00
      ...
- async_extra -> async_extra.109.17.00
    async 109.17.00 requires = 109.17.00
- async_unix -> async_unix.109.18.00
    async 109.17.00 requires >= 109.17.00 & <= 109.18.00
- gen_server -> gen_server.2.0.1
    User requested = 2.0.1
- herelib -> (problem)
    async_unix 109.18.00 requires = 109.15.00
    Rejected candidates:
      herelib.112.35.00: Incompatible with restriction: = 109.15.00
      herelib.109.35.02: Incompatible with restriction: = 109.15.00
      herelib.109.35.00: Incompatible with restriction: = 109.15.00
      herelib.109.15.00: Requires ocaml < 4.06.0
      herelib.109.14.00: Incompatible with restriction: = 109.15.00
      ...
- 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~
- system-mingw -> (problem)
    No usable implementations:
      system-mingw.1: Availability condition not satisfied