Package tar-format

Failed to find a solution:

no platform:
2025-01-08 22:27.28 [INFO] Solving for ocaml-base-compiler, ocaml,
                           tar-format using opam_repository_commit f93eb7cb02fb91bfd11535b3ce693d313341dd60

2025-01-08 22:27.33 [INFO] base: eliminated all possibilities in 2.65 s

2025-01-08 22:27.33 [INFO] = base =

2025-01-08 22:27.33 [INFO] Can't find all required versions.
Selected: ocaml-config.3 ocaml-options-vanilla.1
          tar-format&ocaml&ocaml-base-compiler ocaml-variants
          ocaml-base-compiler ocaml-base-compiler
- ocaml -> ocaml.5.1.1
    User requested <= 5.1.1
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested >= 4.04.1
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.3.0 requires = 5.3.0
    Rejected candidates:
      ocaml-compiler.5.3.0: Requires ocaml = 5.3.0
      ocaml-compiler.5.3.0~rc1: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~beta2: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~beta1: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~alpha1: Incompatible with restriction: = 5.3.0
      ...
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.4.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0~rc1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0~beta2+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- tar-format -> (problem)
    User requested = 0.2.1
    No usable implementations:
      tar-format.0.7.1: Rejected by user-specified constraint tar-format (= 0.2.1)
      tar-format.0.6.1: Rejected by user-specified constraint tar-format (= 0.2.1)
      tar-format.0.6.0: Rejected by user-specified constraint tar-format (= 0.2.1)
      tar-format.0.5.1: Rejected by user-specified constraint tar-format (= 0.2.1)
      tar-format.0.5.0: Rejected by user-specified constraint tar-format (= 0.2.1)
      ...