Package camlp4

Failed to find a solution:

no platform:
2026-02-04 14:33.29 [INFO] Solving for ocaml-base-compiler,
                           camlp4, constraints ocaml-base-compiler<=5.4.0,
                           camlp4=4.06+system using opam_repository_commit 45c04602c2fc908af6d1b17ba39c7517d58cb274

2026-02-04 14:33.30 [INFO] base: eliminated all possibilities in 0.26 s

2026-02-04 14:33.30 [INFO] = base =

2026-02-04 14:33.30 [INFO] Can't find all required versions.
Selected: ocaml-config.3 ocaml-options-vanilla.1 camlp4&ocaml-base-compiler
          ocaml-variants ocaml-base-compiler ocaml-base-compiler
- camlp4 -> camlp4.4.06+system
    User requested = 4.06+system
- ocaml -> ocaml.4.06.2
    camlp4 4.06+system requires >= 4.06 & < 4.07
- ocaml-base-compiler -> ocaml-base-compiler.5.4.0
    User requested <= 5.4.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.4.0 requires = 5.4.0
    Rejected candidates:
      ocaml-compiler.5.6: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.5: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.4.0: Requires ocaml = 5.4.0
      ocaml-compiler.5.4.0~rc1: Incompatible with restriction: = 5.4.0
      ocaml-compiler.5.4.0~beta2: Incompatible with restriction: = 5.4.0
      ...
- ocaml-system -> (problem)
    No usable implementations:
      ocaml-system.5.4.0: Availability condition not satisfied
      ocaml-system.5.3.0: Availability condition not satisfied
      ocaml-system.5.2.1: Availability condition not satisfied
      ocaml-system.5.2.0: Availability condition not satisfied
      ocaml-system.5.1.1: Availability condition not satisfied
      ...
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.6.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0~rc1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...