diff --git a/default.nix b/default.nix
index 9e9ab44..73fda4d 100644
--- a/default.nix
+++ b/default.nix
@@ -17,6 +17,8 @@ let
         LIBCLANG_PATH = "${libclang}/lib";
       };
       brownpaper = attrs: {
+        nativeBuildInputs = [ clang pkgs.pkg-config ];
+        LIBCLANG_PATH = "${libclang}/lib";
         buildInputs = [ pkgs.gmp ];
       };
     };