{ lib, fetchurl, buildDunePackage , cppo, ppxlib, ppx_derivers, result, ounit, ocaml-migrate-parsetree }: let params = if lib.versionAtLeast ppxlib.version "0.15" then { version = "5.1"; sha256 = "1i64fd7qrfzbam5hfbl01r0sx4iihsahcwqj13smmrjlnwi3nkxh"; } else { version = "5.0"; sha256 = "0fkzrn4pdyvf1kl0nwvhqidq01pnq3ql8zk1jd56hb0cxaw851w3"; } ; in buildDunePackage rec { pname = "ppx_deriving"; inherit (params) version; useDune2 = true; src = fetchurl { url = "https://github.com/ocaml-ppx/ppx_deriving/releases/download/v${version}/ppx_deriving-v${version}.tbz"; inherit (params) sha256; }; buildInputs = [ ppxlib cppo ]; propagatedBuildInputs = [ ocaml-migrate-parsetree ppx_derivers result ]; doCheck = true; checkInputs = [ ounit ]; meta = with lib; { description = "deriving is a library simplifying type-driven code generation on OCaml >=4.02."; maintainers = [ maintainers.maurer ]; license = licenses.mit; }; }