Package unix-sys-resource

Failed to find a solution:

no platform:
2025-05-16 18:02.07 [INFO] Solving for ocaml-base-compiler,
                           unix-sys-resource, constraints ocaml-base-compiler<=5.3.0,
                           unix-sys-resource=0.1.0 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 18:02.09 [INFO] base: eliminated all possibilities in 0.55 s

2025-05-16 18:02.09 [INFO] = base =

2025-05-16 18:02.09 [INFO] Can't find all required versions.
Selected: ocaml.5.5.0 ocaml-config.3 ocaml-options-vanilla.1
          ocamlbuild.0.16.1 ocamlfind.1.9.8
          unix-sys-resource&ocaml-base-compiler ocaml-variants
          ocaml-base-compiler ocaml-base-compiler
- ctypes -> (problem)
    unix-sys-resource 0.1.0 requires not(>= 0.6.0)
    Rejected candidates:
      ctypes.0.23.0: Incompatible with restriction: not(>= 0.6.0)
      ctypes.0.22.0: Incompatible with restriction: not(>= 0.6.0)
      ctypes.0.21.1: Requires ocaml >= 4.03.0 & < 5.2
      ctypes.0.20.2: Requires ocaml >= 4.03.0 & < 5.2
      ctypes.0.20.1: Requires ocaml >= 4.03.0 & < 5.2
      ...
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested <= 5.3.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.3.0 requires = 5.3.0
    Rejected candidates:
      ocaml-compiler.5.5: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.4: Incompatible with restriction: = 5.3.0
      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-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      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+BER: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...
- unix-errno -> (problem)
    unix-sys-resource 0.1.0 requires >= 0.3.0 & < 0.4.0
    Rejected candidates:
      unix-errno.0.6.2: Incompatible with restriction: >= 0.3.0 & < 0.4.0
      unix-errno.0.6.1: Incompatible with restriction: >= 0.3.0 & < 0.4.0
      unix-errno.0.6.0: Incompatible with restriction: >= 0.3.0 & < 0.4.0
      unix-errno.0.5.2: Requires ocaml >= 4.01.0 & < 5.0
      unix-errno.0.5.1: Requires ocaml >= 4.01.0 & < 5.0
      ...
- unix-sys-resource -> unix-sys-resource.0.1.0
    User requested = 0.1.0