Package melange

Failed to find a solution:

no platform:
2026-02-04 14:58.26 [INFO] Solving for ocaml-base-compiler,
                           melange, constraints ocaml-base-compiler<=5.4.0,
                           melange=6.0.1-51 using opam_repository_commit 45c04602c2fc908af6d1b17ba39c7517d58cb274

2026-02-04 14:58.27 [INFO] base: eliminated all possibilities in 0.31 s

2026-02-04 14:58.27 [INFO] = base =

2026-02-04 14:58.27 [INFO] Can't find all required versions.
Selected: astring.0.8.5 b0.0.0.6 base.v0.17.3 base-bytes.base
          base-threads.base base-unix.base base64.3.5.2 bigstringaf.0.10.0
          bos.0.2.1 brr.0.0.8 camlp-streams.5.0.1 checkseum.0.5.2
          cmarkit.0.4.0 cmdliner.2.1.0 cppo.1.8.0 crunch.4.0.0 csexp.1.5.2
          cstruct.6.2.0 decompress.1.5.3 dune.3.21.0 dune-build-info.3.21.0
          dune-configurator.3.21.0 eio_linux.1.3 eio_main.1.3 eio_posix.1.3
          fmt.0.11.0 fpath.0.7.3 gen.1.1 iomux.0.4 js_of_ocaml.6.2.0
          js_of_ocaml-compiler.6.2.0 js_of_ocaml-toplevel.6.2.0 jsonm.1.0.2
          logs.0.10.0 lwt.6.1.0 menhir.20260122 menhirCST.20260122
          menhirGLR.20260122 menhirLib.20260122 menhirSdk.20260122
          mtime.2.1.0 num.1.6 ocaml-config.3 ocaml-options-vanilla.1
          ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.16.1 ocamlfind.1.9.8
          ocamlgraph.2.2.0 ocplib-endian.1.2 odig.0.1.0 odoc.3.1.0
          odoc-driver.3.1.0 odoc-md.3.1.0 odoc-parser.3.1.0
          opam-file-format.2.2.0 optint.0.3.0 parsexp.v0.17.0 patch.3.1.0
          ppx_blob.0.9.0 ppx_sexp_conv.v0.17.1 ppxlib_jane.v0.17.0
          progress.0.5.0 ptime.1.2.0 re.1.14.0 result.1.5 rresult.0.7.0
          sedlex.3.7 seq.base sexplib.v0.17.0 sexplib0.v0.17.0 sha.1.15.4
          sherlodoc.3.1.0 stdlib-shims.0.3.0 swhid_core.0.1 terminal.0.5.0
          topkg.1.1.1 tyxml.4.6.0 uring.2.7.0 uucp.17.0.0 uutf.1.0.4
          vector.1.0.0 yojson.3.0.0 melange&ocaml-base-compiler
          ocaml-variants ocaml&vector ocaml-base-compiler ocaml-base-compiler
- eio -> (problem)
    eio_linux 1.3 requires = 1.3
    Rejected candidates:
      eio.1.3: Requires ocaml >= 5.2.0
      eio.1.2: Incompatible with restriction: = 1.3
      eio.1.1: Incompatible with restriction: = 1.3
      eio.1.0: Incompatible with restriction: = 1.3
      eio.0.15: Incompatible with restriction: = 1.3
      ...
- melange -> melange.6.0.1-51
    User requested = 6.0.1-51
- ocaml -> ocaml.5.1.2
    js_of_ocaml-compiler 6.2.0 requires >= 4.13 & < 5.5
    melange 6.0.1-51 requires >= 5.1.1 & < 5.2
- ocaml-base-compiler -> ocaml-base-compiler.5.4.0
    User requested <= 5.4.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.4.0 requires = 5.4.0
    Rejected candidates:
      ocaml-compiler.5.6: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.5: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.4.0: Requires ocaml = 5.4.0
      ocaml-compiler.5.4.0~rc1: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.4.0~beta2: Incompatible with restriction: = 5.4.0
      ...
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.6.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0~rc1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- opam-core -> opam-core.2.4.1
    opam-format 2.4.1 requires = 2.4.1
- opam-format -> opam-format.2.4.1
    odoc-driver 3.1.0 requires >= 2.1.0 & < 2.5.0~~
- ppxlib -> (problem)
    js_of_ocaml 6.2.0 requires >= 0.35
    melange 6.0.1-51 requires >= 0.36
    ppxlib_jane v0.17.0 requires >= 0.28.0 & < 0.36.0
    Rejected candidates:
      ppxlib.0.37.0: Incompatible with restriction: >= 0.28.0 & < 0.36.0
      ppxlib.0.36.2: Incompatible with restriction: >= 0.28.0 & < 0.36.0
      ppxlib.0.36.0: Incompatible with restriction: >= 0.28.0 & < 0.36.0
      ppxlib.0.35.0: Incompatible with restriction: >= 0.36
      ppxlib.0.34.0: Incompatible with restriction: >= 0.35
      ...