Package oui

Failed to find a solution:

no platform:
2026-03-12 09:30.52 [INFO] Solving for ocaml-base-compiler,
                           oui, constraints ocaml-base-compiler<=5.4.0,
                           oui=0.1.0 using opam_repository_commit dee836c0ba666d54bb27be44eaa4aa0087693668

2026-03-12 09:31.43 [INFO] base: eliminated all possibilities in 0.27 s

2026-03-12 09:31.43 [INFO] = base =

2026-03-12 09:31.43 [INFO] Can't find all required versions.
Selected: base-threads.base base-unix.base cmdliner.2.1.0 cppo.1.8.0
          crunch.4.0.0 dune.3.21.1 fmt.0.11.0 ocaml.5.6.0 ocamlbuild.0.16.1
          ocamlfind.1.9.8 ppx_derivers.1.2.1 ppx_deriving.6.1.1
          ppx_deriving_yojson.3.10.0 ptime.1.2.0 topkg.1.1.1 yojson.3.0.0
          oui&ocaml-base-compiler ocaml-base-compiler
- ocaml-base-compiler -> (problem)
    User requested <= 5.4.0
    ocaml-base-compiler|ocaml-variants|ocaml-system|dkml-base-compiler ocaml-base-compiler requires >= 5.6.0 & < 5.6.1~
    Rejected candidates:
      ocaml-base-compiler.5.4.0: Incompatible with restriction: >= 5.6.0 & < 5.6.1~
      ocaml-base-compiler.5.4.0~rc1: Incompatible with restriction: >= 5.6.0 & < 5.6.1~
      ocaml-base-compiler.5.4.0~beta2: Incompatible with restriction: >= 5.6.0 & < 5.6.1~
      ocaml-base-compiler.5.4.0~beta1: Incompatible with restriction: >= 5.6.0 & < 5.6.1~
      ocaml-base-compiler.5.4.0~alpha1: Incompatible with restriction: >= 5.6.0 & < 5.6.1~
      ...
- odoc -> (problem)
    dune 3.21.1 requires not(< 2.0.1)
    Rejected candidates:
      odoc.3.1.0: Requires ocaml >= 4.08.0 & < 5.5
      odoc.3.0.0: Requires cmdliner >= 1.0.0 & < 2.0.0
      odoc.2.1.1: Requires cmdliner >= 1.0.0 & < 2.0.0
      odoc.1.5.3: Incompatible with restriction: not(< 2.0.1)
- opam-client -> (problem)
    oui 0.1.0 requires >= 2.5 & = 2.1.0
    Rejected candidates:
      opam-client.2.5.0: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-client.2.5.0~rc1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-client.2.5.0~beta1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-client.2.5.0~alpha1: Requires ocaml >= 4.08.0 & < 5.5
      opam-client.2.4.1: Requires ocaml >= 4.08.0 & < 5.5
      ...
- opam-core -> (problem)
    oui 0.1.0 requires >= 2.5 & = 2.1.0
    Rejected candidates:
      opam-core.2.5.0: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-core.2.5.0~rc1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-core.2.5.0~beta1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-core.2.5.0~alpha1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-core.2.4.1: Incompatible with restriction: >= 2.5 & = 2.1.0
      ...
- opam-format -> (problem)
    oui 0.1.0 requires >= 2.5 & = 2.1.0
    Rejected candidates:
      opam-format.2.5.0: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-format.2.5.0~rc1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-format.2.5.0~beta1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-format.2.5.0~alpha1: Incompatible with restriction: >= 2.5 & = 2.1.0
      opam-format.2.4.1: Incompatible with restriction: >= 2.5 & = 2.1.0
      ...
- oui -> oui.0.1.0
    User requested = 0.1.0
- ppxlib -> (problem)
    ppx_deriving 6.1.1 requires >= 0.36.0
    Rejected candidates:
      ppxlib.0.38.0~5.5preview: Requires ocaml >= 4.08.0 & < 5.6.0
      ppxlib.0.37.0: Requires ocaml >= 4.08.0 & < 5.5.0
      ppxlib.0.36.2: Requires ocaml >= 4.08.0 & < 5.4.0
      ppxlib.0.36.0: Requires ocaml >= 4.08.0 & < 5.4.0
      ppxlib.0.35.0: Incompatible with restriction: >= 0.36.0
      ...