@ -1,4 +1,4 @@
{stdenv, fetchurl, ocaml, findlib }:
{ stdenv, fetchurl, ocaml, findlib, camlp4 }:
let
ocaml_version = (builtins.parseDrvName ocaml.name).version;
@ -17,7 +17,8 @@ stdenv.mkDerivation {
createFindlibDestdir = true;
buildInputs = [ocaml findlib];
buildInputs = [ ocaml findlib ];
propagatedBuildInputs = [ camlp4 ];
buildFlags = "all all.opt";