diff --git a/pkgs/development/compilers/ocaml/3.11.1.nix b/pkgs/development/compilers/ocaml/3.11.1.nix
index 60dc51575016..0add40dcd68f 100644
--- a/pkgs/development/compilers/ocaml/3.11.1.nix
+++ b/pkgs/development/compilers/ocaml/3.11.1.nix
@@ -18,6 +18,8 @@ stdenv.mkDerivation rec {
   # Needed to avoid a SIGBUS on the final executable on mips
   NIX_CFLAGS_COMPILE = if stdenv.isMips then "-fPIC" else "";
 
+  patches = optionals stdenv.isDarwin [ ./gnused-on-osx-fix.patch ];
+
   prefixKey = "-prefix ";
   configureFlags = ["-no-tk"] ++ optionals useX11 [ "-x11lib" x11 ];
   buildFlags = "world" + optionalString useNativeCompilers " bootstrap world.opt";
diff --git a/pkgs/development/compilers/ocaml/gnused-on-osx-fix.patch b/pkgs/development/compilers/ocaml/gnused-on-osx-fix.patch
new file mode 100644
index 000000000000..dc2bcb869766
--- /dev/null
+++ b/pkgs/development/compilers/ocaml/gnused-on-osx-fix.patch
@@ -0,0 +1,9 @@
+diff -Nuar ocaml-3.11.1/ocamldoc/remove_DEBUG ocaml-3.11.1-nixpkgs/ocamldoc/remove_DEBUG
+--- ocaml-3.11.1/ocamldoc/remove_DEBUG	2004-04-15 18:18:52.000000000 +0200
++++ ocaml-3.11.1-nixpkgs/ocamldoc/remove_DEBUG	2011-01-01 17:37:07.000000000 +0100
+@@ -18,4 +18,4 @@
+ # respecting the cpp # line annotation conventions
+ 
+ echo "# 1 \"$1\""
+-LC_ALL=C sed -e '/DEBUG/s/.*//' "$1"
++grep -v 'DEBUG' "$1"