Package leveldb

Failed to find a solution:

no platform:
2024-01-29 14:50.01 [INFO] Solving for ocaml-base-compiler, ocaml,
                           leveldb using opam_repository_commit 251c5edf2ecdd2541c324dacb931c3606ee71eeb

2024-01-29 14:50.06 [INFO] base: eliminated all possibilities in 2.80 s

2024-01-29 14:50.06 [INFO] = base =

2024-01-29 14:50.06 [INFO] Can't find all required versions.
Selected: conf-leveldb.2 conf-snappy.1 ocaml-config.3 ocamlfind.1.9.6
          omake.0.9.8.6-0.rc1 ounit.2.2.7 leveldb&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler
- leveldb -> leveldb.1.0.3
    User requested = 1.0.3
- ocaml -> ocaml.4.01.0
    User requested <= 5.1.0
    leveldb 1.0.3 requires < 4.02
- 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
      ...
- ounit2 -> (problem)
    ounit 2.2.7 requires = 2.2.7
    Rejected candidates:
      ounit2.2.2.7: Requires ocaml >= 4.04.0
      ounit2.2.2.6: Incompatible with restriction: = 2.2.7
      ounit2.2.2.5: Incompatible with restriction: = 2.2.7
      ounit2.2.2.4: Incompatible with restriction: = 2.2.7
      ounit2.2.2.3: Incompatible with restriction: = 2.2.7
      ...