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diff --git a/dev-ml/ppxlib/files/ppxlib-0.23.0-fix-ocaml-4.13.patch b/dev-ml/ppxlib/files/ppxlib-0.23.0-fix-ocaml-4.13.patch
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+++ b/dev-ml/ppxlib/files/ppxlib-0.23.0-fix-ocaml-4.13.patch
@@ -0,0 +1,23 @@
+https://github.com/ocaml-ppx/ppxlib/commit/ce371cfb4c2ad712cd8e9b803bbf4ef650aa5e72
+
+From: Sonja Heinze <sonjaleaheinze@gmail.com>
+Date: Fri, 10 Sep 2021 16:08:22 +0200
+Subject: [PATCH] Make our expect-test version compatible with 4.13 compiler
+
+The Warnings.parse_options function was returning a unit on older compilers
+and is returning an alert option now, but under the hood it still has the
+same side-effects.
+
+Signed-off-by: Sonja Heinze <sonjaleaheinze@gmail.com>
+--- a/test/expect/expect_test.ml
++++ b/test/expect/expect_test.ml
+@@ -63,7 +63,7 @@ let main () =
+ setup_printers ppf;
+ Topfind.log := ignore;
+
+- Warnings.parse_options false "@a-4-29-40-41-42-44-45-48-58";
++ let _ = Warnings.parse_options false "@a-4-29-40-41-42-44-45-48-58" in
+ Clflags.real_paths := false;
+ Toploop.initialize_toplevel_env ();
+
+