diff --git a/pkgs/development/tools/ocaml/omake/warn.patch b/pkgs/development/tools/ocaml/omake/warn.patch
new file mode 100644
index 00000000000..4459e89d7f9
--- /dev/null
+++ b/pkgs/development/tools/ocaml/omake/warn.patch
@@ -0,0 +1,10 @@
+diff -p1 -aur ../omake-0.9.8.6.ori/lib/build/OCaml.om ./lib/build/OCaml.om
+--- ../omake-0.9.8.6.ori/lib/build/OCaml.om	2008-03-05 01:07:25.000000000 +0000
++++ ./lib/build/OCaml.om	2013-06-01 15:52:37.000000000 +0000
+@@ -178,3 +178,3 @@ declare OCAMLDEPFLAGS
+ public.OCAMLPPFLAGS  =
+-public.OCAMLFLAGS    = -warn-error A
++public.OCAMLFLAGS    =
+ public.OCAMLCFLAGS   = -g
+Seulement dans ./lib/build: OCaml.om~
+Seulement dans .: warn.patch