diff --git a/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix b/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix
new file mode 100644
index 00000000000..9f318afc67d
--- /dev/null
+++ b/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix
@@ -0,0 +1,38 @@
+{stdenv, fetchurl, makeWrapper, ocaml, ncurses}:
+let
+  pname = "omake";
+  version = "0.9.8.6-0.rc1";
+  webpage = "http://omake.metaprl.org";
+in
+stdenv.mkDerivation {
+
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "http://pkgs.fedoraproject.org/repo/pkgs/ocaml-omake/${pname}-${version}.tar.gz/fe39a476ef4e33b7ba2ca77a6bcaded2/${pname}-${version}.tar.gz";
+    sha256 = "1sas02pbj56m7wi5vf3vqrrpr4ynxymw2a8ybvfj2dkjf7q9ii13";
+  };
+  patchFlags = "-p0";
+  patches = [ ./warn.patch ];
+
+  buildInputs = [ ocaml makeWrapper ncurses ];
+
+  phases = "unpackPhase patchPhase buildPhase";
+  buildPhase = ''
+    make bootstrap
+    make PREFIX=$out all
+    make PREFIX=$out install
+  '';
+#  prefixKey = "-prefix ";
+#
+#  configureFlags = if transitional then "--transitional" else "--strict";
+#
+#  buildFlags = "world.opt";		
+
+  meta = {
+    description = "Omake build system";
+    homepage = "${webpage}";
+    license = "GPL";
+    platforms = ocaml.meta.platforms or [];
+  };
+}
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
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e2502d36dbf..3f5926c1879 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6376,6 +6376,8 @@ in
     inherit (ocamlPackages_4_02) ocaml;
   };
 
+  inherit (ocamlPackages) omake_rc1;
+
   omniorb = callPackage ../development/tools/omniorb { };
 
   opengrok = callPackage ../development/tools/misc/opengrok { };
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index dc497b125e6..6e3f98c7ba2 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -649,6 +649,8 @@ let
 
     trv = callPackage ../development/tools/misc/trv { };
 
+    omake_rc1 = callPackage ../development/tools/ocaml/omake/0.9.8.6-rc1.nix { };
+
     verasco = callPackage ../development/tools/analysis/verasco (
       if system == "x86_64-linux"
       then { tools = pkgs.pkgsi686Linux.stdenv.cc; }