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

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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 ];
}