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{ lib, buildDunePackage, cstruct, lwt }: if !lib.versionAtLeast (cstruct.version or "1") "3" then cstruct else buildDunePackage { pname = "cstruct-lwt"; inherit (cstruct) version src meta; minimumOCamlVersion = "4.02"; propagatedBuildInputs = [ cstruct lwt ]; }