Package opam-installext

Failed to find a solution:

no platform:
2024-09-12 08:12.06 [INFO] Solving for ocaml-base-compiler, ocaml,
                           opam-installext using opam_repository_commit 0329818dcfd3de1a722ea09eeeed94cd24caa375

2024-09-12 08:12.13 [INFO] base: eliminated all possibilities in 3.61 s

2024-09-12 08:12.13 [INFO] = base =

2024-09-12 08:12.13 [INFO] Can't find all required versions.
Selected: ocaml-config.3 opam-installext&ocaml&ocaml-base-compiler
          ocaml-base-compiler ocaml-base-compiler
- ocaml -> ocaml.4.01.0
    User requested <= 5.1.1
    opam-installext 1.0.1 requires < 4.02.0
- ocaml-base-compiler -> (problem)
    User requested >= 4.04.1
    Rejected candidates:
      ocaml-base-compiler.5.2.0: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~rc1: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~beta2: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~beta1: Requires ocaml = 5.2.0
      ocaml-base-compiler.5.2.0~alpha1: Requires ocaml = 5.2.0
      ...
- opam-installext -> opam-installext.1.0.1
    User requested = 1.0.1