Package vchan-unix

Failed to find a solution:

no platform:
2024-01-29 15:13.40 [INFO] Solving for ocaml-base-compiler, ocaml,
                           vchan-unix using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 15:13.45 [INFO] base: eliminated all possibilities in 2.22 s

2024-01-29 15:13.45 [INFO] = base =

2024-01-29 15:13.45 [INFO] Can't find all required versions.
Selected: base.v0.16.3 base-bigarray.base base-bytes.base base-domains.base
          base-nnp.base base-threads.base base-unix.base cmdliner.1.2.0
          conf-pkg-config.3 conf-xen.1 cppo.1.6.9 csexp.1.5.2 cstruct.6.2.0
          dune.3.13.0 dune-configurator.3.13.0 fmt.0.9.0 io-page.3.0.0
          lwt.5.7.0 lwt-dllist.1.0.1 num.1.5 ocaml-compiler-libs.v0.12.4
          ocaml-config.3 ocaml-options-vanilla.1 ocamlbuild.0.14.3
          ocamlfind.1.9.6 ocplib-endian.1.2 parsexp.v0.16.0 ppx_cstruct.6.2.0
          ppx_derivers.1.2.1 ppx_sexp_conv.v0.16.0 ppxlib.0.31.0 result.1.5
          sexplib.v0.16.0 sexplib0.v0.16.0 stdlib-shims.0.3.0 topkg.1.0.7
          xen-evtchn.2.1.0 xen-evtchn-unix.2.1.0 xenstore.2.2.0
          xenstore_transport.1.3.0 vchan-unix&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler ocaml base-domains ocaml
          ocaml-base-compiler
- io-page-unix -> (problem)
    Rejected candidates:
      io-page-unix.2.3.0: Requires io-page = 2.3.0
      io-page-unix.2.2.0: Requires io-page < 3.0.0
      io-page-unix.2.1.0: Requires io-page >= 2.1.0 & < 3.0.0
      io-page-unix.2.0.1: Requires io-page >= 2.0.0 & < 3.0.0
      io-page-unix.2.0.0: Requires io-page >= 2.0.0 & < 3.0.0
      ...
- mirage-flow-lwt -> (problem)
    Rejected candidates:
      mirage-flow-lwt.1.6.0: Requires cstruct >= 2.0.0 & < 6.1.0
      mirage-flow-lwt.1.5.0: Requires cstruct >= 2.0.0 & < 6.1.0
      mirage-flow-lwt.1.4.0: Requires lwt < 5.6.0
      mirage-flow-lwt.1.3.0: Requires lwt < 5.6.0
      mirage-flow-lwt.1.2.0: Requires fmt < 0.8.10
- ocaml -> ocaml.5.1.0
    User requested <= 5.1.0
- ocaml-base-compiler -> ocaml-base-compiler.5.1.0
    User requested >= 4.04.1
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.1.0~ & < 5.1.1~
- ppx_tools -> (problem)
    Rejected candidates:
      ppx_tools.6.6: Requires ocaml >= 4.08.0 & < 5.1.0
      ppx_tools.6.5: Requires ocaml >= 4.08.0 & < 4.15.0
      ppx_tools.6.4: Requires ocaml >= 4.08.0 & < 4.14.0
      ppx_tools.6.3: Requires ocaml >= 4.08.0 & < 4.13.0
      ppx_tools.6.2: Requires ocaml >= 4.08.0 & < 4.12.0
      ...
- vchan -> (problem)
    vchan-unix 4.0.1 requires >= 4.0.0 & < 4.0.2
    Rejected candidates:
      vchan.6.0.1: Incompatible with restriction: >= 4.0.0 & < 4.0.2
      vchan.6.0.0: Requires cstruct >= 1.9.0 & < 6.1.0
      vchan.5.0.0: Requires cstruct >= 1.9.0 & < 6.1.0
      vchan.4.0.3: Incompatible with restriction: >= 4.0.0 & < 4.0.2
      vchan.4.0.2: Incompatible with restriction: >= 4.0.0 & < 4.0.2
      ...
- vchan-unix -> vchan-unix.4.0.1
    User requested = 4.0.1
- xen-gnt-unix -> (problem)
    Rejected candidates:
      xen-gnt-unix.4.0.1: Requires ocaml >= 4.08.0 & < 5.0
      xen-gnt-unix.4.0.0: Requires ocaml >= 4.03.0 & < 5.0
      xen-gnt-unix.3.1.0: Requires ocaml >= 4.03.0 & < 5.0
      xen-gnt-unix.3.0.1: Requires ocaml >= 4.03.0 & < 5.0
      xen-gnt-unix.3.0.0: Requires ocaml >= 4.00.0 & < 5.0