i think what you want is:

let
  inherit (callPackage ./generic.nix args) src version library_deps;
in
lib.throwIf
  (
    lib.versionAtLeast ocaml.version "5.0" && !lib.versionAtLeast version "0.23"
    || lib.versionAtLeast ocaml.version "5.1" && !lib.versionAtLeast version "0.25"
    || lib.versionAtLeast ocaml.version "5.2" && !lib.versionAtLeast version "0.26.2"
    || lib.versionAtLeast ocaml.version "5.3" && !lib.versionAtLeast version "0.27"
    || lib.versionAtLeast ocaml.version "5.4" && !lib.versionAtLeast version "0.28"
  )
  "ocamlformat ${version} is not available for OCaml ${ocaml.version}"
buildDunePackage {
  pname = "ocamlformat";
  inherit src version;
  minimalOCamlVersion = "4.08";