diff --git a/ocaml-labltk.spec b/ocaml-labltk.spec
index b7a7148..fbb4dc6 100644
--- a/ocaml-labltk.spec
+++ b/ocaml-labltk.spec
@@ -1,3 +1,8 @@
+# This breaks basic usage of the package:
+# ocamlfind ocamlopt -package labltk tktest.ml -linkpkg -o tktest
+# gcc: fatal error: environment variable ‘RPM_ARCH’ not defined
+%undefine _package_note_flags
+
 # OCaml packages not built on i686 since OCaml 5 / Fedora 39.
 ExcludeArch: %{ix86}