nixpkgs/pkgs/development/ocaml-modules/cstruct/ppx.nix

{ lib, buildDunePackage, cstruct, ppx_tools_versioned }:

if !lib.versionAtLeast (cstruct.version or "1") "3"
then cstruct
else

buildDunePackage {
	pname = "ppx_cstruct";
	inherit (cstruct) version src meta;

  minimumOCamlVersion = "4.02";

	buildInputs = [ ppx_tools_versioned ];
	propagatedBuildInputs = [ cstruct ];
}