Package llvm

Failed to find a solution:

no platform:
2024-01-29 15:02.13 [INFO] Solving for ocaml-base-compiler, ocaml,
                           llvm using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 15:02.18 [INFO] base: eliminated all possibilities in 2.67 s

2024-01-29 15:02.18 [INFO] = base =

2024-01-29 15:02.18 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-domains.base base-threads.base
          base-unix.base ocaml-config.3 ocaml-options-vanilla.1
          ocamlbuild.0.14.3 llvm&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler ocaml ocaml-base-compiler
- base-nnp -> (problem)
    llvm 3.6 requires conflict with all versions
    Rejected candidates:
      base-nnp.base: Incompatible with restriction: conflict with all versions
- ctypes -> (problem)
    llvm 3.6 requires >= 0.3.4 & < 0.4
    Rejected candidates:
      ctypes.0.21.1: Incompatible with restriction: >= 0.3.4 & < 0.4
      ctypes.0.20.2: Incompatible with restriction: >= 0.3.4 & < 0.4
      ctypes.0.20.1: Incompatible with restriction: >= 0.3.4 & < 0.4
      ctypes.0.20.0: Incompatible with restriction: >= 0.3.4 & < 0.4
      ctypes.0.19.1: Incompatible with restriction: >= 0.3.4 & < 0.4
      ...
- llvm -> llvm.3.6
    User requested = 3.6
- 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~