Package otr

Failed to find a solution:

no platform:
2024-01-29 14:52.00 [INFO] Solving for ocaml-base-compiler, ocaml,
                           otr using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 14:52.05 [INFO] base: eliminated all possibilities in 2.38 s

2024-01-29 14:52.05 [INFO] = base =

2024-01-29 14:52.05 [INFO] Can't find all required versions.
Selected: base-bytes.base base-ocamlbuild.base base-threads.base
          base-unix.base camlp4.4.02.0-1modular-implicits conf-gmp.4
          conf-perl.2 conf-pkg-config.3 conf-time.1 conf-which.1 cppo.1.6.9
          dune.3.13.0 mirage-no-xen.1 ocaml-config.3
          ocaml-secondary-compiler.4.08.1-1 ocamlbuild.0 ocamlfind.1.9.6
          ocamlfind-secondary.1.9.6 ocplib-endian.1.1 type_conv.113.00.02
          zarith.1.11 otr&ocaml&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler ocaml&ocamlfind-secondary mirage-no-xen
- cstruct -> cstruct.1.9.0
    nocrypto 0.4.0 requires >= 1.4.0 & < 3.0.0
    otr 0.1.0 requires >= 1.2.0 & < 2.0.0
- ctypes -> ctypes.0.5.1
    nocrypto 0.4.0 requires >= 0.3.3 & <= 0.5.1
- nocrypto -> nocrypto.0.4.0
    otr 0.1.0 requires >= 0.3.0 & < 0.5.0
- ocaml -> ocaml.4.02.4
    User requested <= 5.1.0
    base-ocamlbuild base requires >= 3.10 & < 4.03
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      ocaml-base-compiler.5.1.1: Requires ocaml = 5.1.1
      ocaml-base-compiler.5.1.1~rc1: Requires ocaml = 5.1.1
      ocaml-base-compiler.5.1.0: Requires ocaml = 5.1.0
      ocaml-base-compiler.5.1.0~rc3: Requires ocaml = 5.1.0
      ocaml-base-compiler.5.1.0~rc2: Requires ocaml = 5.1.0
      ...
- ocaml-variants -> (problem)
    camlp4 4.02.0-1modular-implicits requires = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
    Rejected candidates:
      ocaml-variants.5.3.0+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.2.0+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.2+trunk: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.1+tsan: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ocaml-variants.5.1.1+options: Incompatible with restriction: = 4.02.0+modular-implicits | = 4.02.1+modular-implicits-ber
      ...
- otr -> otr.0.1.0
    User requested = 0.1.0
- sexplib -> sexplib.113.00.00
    nocrypto 0.4.0 requires < 113.01.00