Package dkml-base-compiler

Failed to find a solution:

no platform:
2025-05-16 17:36.26 [INFO] Solving for ocaml-base-compiler,
                           dkml-base-compiler, constraints ocaml-base-compiler<=5.3.0,
                           dkml-base-compiler=4.12.1~v1.0.0 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 17:36.28 [INFO] base: eliminated all possibilities in 0.55 s

2025-05-16 17:36.28 [INFO] = base =

2025-05-16 17:36.28 [INFO] Can't find all required versions.
Selected: base-bigarray.base base-threads.base base-unix.base ocaml-config.3
          dkml-base-compiler&ocaml-base-compiler ocaml-base-compiler
          ocaml-base-compiler
- dkml-base-compiler -> dkml-base-compiler.4.12.1~v1.0.0
    User requested = 4.12.1~v1.0.0
- ocaml -> ocaml.4.12.1
    dkml-base-compiler 4.12.1~v1.0.0 requires = 4.12.1
- ocaml-base-compiler -> (problem)
    User requested <= 5.3.0
    Rejected candidates:
      ocaml-base-compiler.5.3.0: In same conflict class (ocaml-core-compiler) as dkml-base-compiler
      ocaml-base-compiler.5.3.0~rc1: In same conflict class (ocaml-core-compiler) as dkml-base-compiler
      ocaml-base-compiler.5.3.0~beta2: In same conflict class (ocaml-core-compiler) as dkml-base-compiler
      ocaml-base-compiler.5.3.0~beta1: In same conflict class (ocaml-core-compiler) as dkml-base-compiler
      ocaml-base-compiler.5.3.0~alpha1: In same conflict class (ocaml-core-compiler) as dkml-base-compiler
      ...