Package session

Failed to find a solution:

no platform:
2025-05-16 18:01.14 [INFO] Solving for ocaml-base-compiler,
                           session, constraints ocaml-base-compiler<=5.3.0,
                           session=0.3.2 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 18:01.15 [INFO] base: eliminated all possibilities in 0.61 s

2025-05-16 18:01.15 [INFO] = base =

2025-05-16 18:01.15 [INFO] Can't find all required versions.
Selected: astring.0.8.5 base.v0.17.2 base-threads.base base-unix.base
          bigarray-compat.1.1.0 conf-gmp.5 conf-pkg-config.4 cppo.1.8.0
          cpuid.0.1.2 csexp.1.5.2 cstruct-lwt.6.0.1 dune.3.18.2
          dune-configurator.3.18.2 mirage-no-solo5.1 mirage-no-xen.1
          nocrypto.0.5.4-2 num.1.5-1 ocaml.5.5.0 ocaml-config.3
          ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1
          ocamlbuild.0.16.1 ocamlfind.1.9.8 ocb-stubblr.0.1.1-1
          parsexp.v0.17.0 ppx_derivers.1.2.1 ppx_deriving.6.1.0
          ppx_sexp_conv.v0.17.0 ppxlib_jane.v0.17.2 result.1.5
          sexplib.v0.17.0 sexplib0.v0.17.0 topkg.1.0.8 zarith.1.14
          session&ocaml-base-compiler ocaml-variants ocaml-base-compiler
          mirage-no-solo5 mirage-no-xen ocaml-base-compiler
- cstruct -> cstruct.6.0.1
    cstruct-lwt 6.0.1 requires = 6.0.1
- lwt -> (problem)
    session 0.3.2 requires not(>= 4.0.0)
    Rejected candidates:
      lwt.5.9.1: Incompatible with restriction: not(>= 4.0.0)
      lwt.5.9.0: Incompatible with restriction: not(>= 4.0.0)
      lwt.5.8.1: Incompatible with restriction: not(>= 4.0.0)
      lwt.5.8.0: Incompatible with restriction: not(>= 4.0.0)
      lwt.5.7.0: Incompatible with restriction: not(>= 4.0.0)
      ...
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested <= 5.3.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.3.0 requires = 5.3.0
    Rejected candidates:
      ocaml-compiler.5.5: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.4: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0: Requires ocaml = 5.3.0
      ocaml-compiler.5.3.0~rc1: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~beta2: Incompatible with restriction: = 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.5.3.1+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+BER: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- ppxlib -> (problem)
    ppx_deriving 6.1.0 requires >= 0.36.0
    ppx_sexp_conv v0.17.0 requires >= 0.28.0 & < 0.36.0
    Rejected candidates:
      ppxlib.0.36.0: Incompatible with restriction: >= 0.28.0 & < 0.36.0
      ppxlib.0.35.0: Incompatible with restriction: >= 0.36.0
      ppxlib.0.34.0: Incompatible with restriction: >= 0.36.0
      ppxlib.0.33.0: Incompatible with restriction: >= 0.36.0
      ppxlib.0.32.1: Incompatible with restriction: >= 0.36.0
      ...
- session -> session.0.3.2
    User requested = 0.3.2