Package nbd

Failed to find a solution:

no platform:
2025-05-16 18:02.30 [INFO] Solving for ocaml-base-compiler,
                           nbd, constraints ocaml-base-compiler<=5.3.0,
                           nbd=3.0.0 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 18:02.32 [INFO] base: eliminated all possibilities in 0.63 s

2025-05-16 18:02.32 [INFO] = base =

2025-05-16 18:02.32 [INFO] Can't find all required versions.
Selected: angstrom.0.16.1 astring.0.8.5 base.v0.17.2 base-threads.base
          base-unix.base base64.3.5.1 bigstringaf.0.10.0 bos.0.2.1
          camlp-streams.5.0.1 cmdliner.1.3.0 conf-pkg-config.4 cppo.1.8.0
          csexp.1.5.2 cstruct-lwt.3.7.0 domain-name.0.4.1 dune.3.18.2
          dune-configurator.3.18.2 duration.0.2.1 emile.1.1 fmt.0.10.0
          fpath.0.7.3 io-page.3.0.0 ipaddr.5.6.0 logs.0.8.0 macaddr.5.6.0
          mirage.4.9.0 mirage-block-lwt.1.2.0 mirage-channel-lwt.3.2.0
          mirage-clock-lwt.2.0.0 mirage-console-lwt.2.4.3
          mirage-flow-lwt.1.6.0 mirage-fs-lwt.2.0.0 mirage-kv-lwt.2.0.0
          mirage-net-lwt.2.0.0 mirage-protocols-lwt.3.1.0
          mirage-stack-lwt.1.4.0 mirage-time-lwt.1.3.0 num.1.5-1 oasis.0.4.11
          ocaml.5.5.0 ocaml-config.3 ocaml-options-vanilla.1
          ocaml-syntax-shims.1.0.0 ocaml_intrinsics_kernel.v0.17.1
          ocamlbuild.0.16.1 ocamlfind.1.9.8 ocamlify.0.1.0
          opam-monorepo.0.4.2 parsexp.v0.17.0 pecu.0.7 ppx_derivers.1.2.1
          ppx_deriving.6.1.0 ppx_sexp_conv.v0.17.0 ppx_tools_versioned.5.4.0
          ppxlib_jane.v0.17.2 result.1.5 rresult.0.7.0 sexplib.v0.17.0
          sexplib0.v0.17.0 stringext.1.6.0 topkg.1.0.8 uri.4.4.0 uutf.1.0.4
          nbd&ocaml-base-compiler ocaml-variants ocaml-base-compiler
          ocaml-base-compiler
- cstruct -> cstruct.3.3.0
    cstruct-lwt 3.7.0 requires >= 3.2.0 & < 6.1.0
    mirage-block-lwt 1.2.0 requires >= 2.0.0 & < 6.0.1
    nbd 3.0.0 requires >= 1.9.0 & < 3.4.0
- io-page-unix -> (problem)
    No usable implementations:
      io-page-unix.2.3.0: Availability condition not satisfied
      io-page-unix.2.2.0: Availability condition not satisfied
      io-page-unix.2.1.0: Availability condition not satisfied
      io-page-unix.2.0.1: Availability condition not satisfied
      io-page-unix.2.0.0: Availability condition not satisfied
- lwt -> (problem)
    nbd 3.0.0 requires < 5.0.0
    Rejected candidates:
      lwt.5.9.1: Incompatible with restriction: < 5.0.0
      lwt.5.9.0: Incompatible with restriction: < 5.0.0
      lwt.5.8.1: Incompatible with restriction: < 5.0.0
      lwt.5.8.0: Incompatible with restriction: < 5.0.0
      lwt.5.7.0: Incompatible with restriction: < 5.0.0
      ...
- mirage-block -> mirage-block.1.2.0
    mirage-block-lwt 1.2.0 requires >= 1.0.0 & < 2.0.0
- mirage-block-unix -> (problem)
    Rejected candidates:
      mirage-block-unix.2.14.2: Requires cstruct >= 6.0.0
      mirage-block-unix.2.14.1: Requires cstruct >= 6.0.0
      mirage-block-unix.2.14.0: Requires ocaml >= 4.06.0 & < 5.0
      mirage-block-unix.2.13.0: Requires ocaml >= 4.06.0 & < 5.0
      mirage-block-unix.2.12.1: Requires ocaml >= 4.06.0 & < 5.0
      ...
- mirage-channel -> mirage-channel.3.2.0
    mirage-channel-lwt 3.2.0 requires >= 3.0.0 & < 4.0.0
- mirage-clock -> mirage-clock.2.0.0
    mirage-clock-lwt 2.0.0 requires >= 1.2.0 & < 3.0.0
- mirage-console -> mirage-console.2.4.3
    mirage-console-lwt 2.4.3 requires = 2.4.3 & < 3.0.0
- mirage-device -> mirage-device.1.2.0
    mirage-block 1.2.0 requires >= 1.0.0 & < 2.0.0
- mirage-flow -> mirage-flow.1.6.0
    mirage-channel 3.2.0 requires >= 1.2.0 & < 2.0.0
- mirage-fs -> mirage-fs.2.0.0
    mirage-fs-lwt 2.0.0 requires >= 1.0.0 & < 3.0.0
- mirage-kv -> mirage-kv.2.0.0
    mirage-kv-lwt 2.0.0 requires >= 2.0.0 & < 3.0.0
- mirage-net -> mirage-net.2.0.0
    mirage-net-lwt 2.0.0 requires >= 2.0.0 & < 3.0.0
- mirage-protocols -> mirage-protocols.3.1.0
    mirage-protocols-lwt 3.1.0 requires >= 2.0.0 & < 4.0.0
- mirage-random -> mirage-random.1.2.0
    mirage-types 3.6.0 requires >= 1.2.0 & < 2.0.0
- mirage-stack -> mirage-stack.1.4.0
    mirage-stack-lwt 1.4.0 requires >= 1.3.0 & < 2.0.0
- mirage-time -> mirage-time.1.3.0
    mirage-time-lwt 1.3.0 requires >= 1.0.0 & < 2.0.0
- mirage-types -> mirage-types.3.6.0
    mirage-types-lwt 3.6.0 requires >= 3.5.0 & < 3.7.0
- mirage-types-lwt -> mirage-types-lwt.3.6.0
    nbd 3.0.0 requires >= 3.0.0 & < 3.7.0
- nbd -> nbd.3.0.0
    User requested = 3.0.0
- 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-migrate-parsetree -> (problem)
    Rejected candidates:
      ocaml-migrate-parsetree.2.4.0: Requires ocaml >= 4.02.3 & < 5.1
      ocaml-migrate-parsetree.2.3.0: Requires ocaml >= 4.02.3 & < 4.15
      ocaml-migrate-parsetree.2.2.0: Requires ocaml >= 4.02.3 & < 4.14
      ocaml-migrate-parsetree.2.1.0: Requires ocaml >= 4.02.3 & < 4.13
      ocaml-migrate-parsetree.2.0.0: Requires ocaml >= 4.02.3 & < 4.12
      ...
- 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
      ...
- ocamlmod -> (problem)
    Rejected candidates:
      ocamlmod.0.0.9: Requires ocaml < 5.0
      ocamlmod.0.0.8: Requires ocaml < 5.0
- ppx_cstruct -> ppx_cstruct.3.3.0
    nbd 3.0.0 requires < 3.4.0
- 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
      ...
- 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
      ...