diff --git a/Formula/open-scene-graph.rb b/Formula/open-scene-graph.rb
index b762f060a63..3a98513df33 100644
--- a/Formula/open-scene-graph.rb
+++ b/Formula/open-scene-graph.rb
@@ -3,7 +3,7 @@ require 'formula'
 class OpenSceneGraph < Formula
   homepage 'http://www.openscenegraph.org/projects/osg'
   url 'http://www.openscenegraph.org/downloads/stable_releases/OpenSceneGraph-3.0.1/source/OpenSceneGraph-3.0.1.zip'
-  md5 'c43a25d023e635c3566b2083d8e6d956'
+  sha1 '13c7e39f6d62047ad944d8d28a0f0eb60384ce33'
   head 'http://www.openscenegraph.org/svn/osg/OpenSceneGraph/trunk/'
 
   depends_on 'cmake' => :build
@@ -23,33 +23,28 @@ class OpenSceneGraph < Formula
   end
 
   fails_with :clang do
-    build 318
+    build 421
     cause <<-EOS.undent
       cannot initialize a parameter of type 'void *' with an lvalue of type 'const void *const'
       http://forum.openscenegraph.org/viewtopic.php?t=10042
       EOS
   end
 
-  # First patch: The mini-Boost finder in FindCOLLADA doesn't find our boost, so fix it.
-  # Second patch:
-  # Lion replacement for CGDisplayBitsPerPixel();
-  # taken from: http://www.openscenegraph.org/projects/osg/changeset/12790/OpenSceneGraph/trunk/src/osgViewer/DarwinUtils.mm
-  # Issue at: https://github.com/mxcl/homebrew/issues/11391
-  # the second patch should be obsolete with some newer versions (current version is: 3.0.1, it's fixed upstream in 3.1.1)
+  # 1: The mini-Boost finder in FindCOLLADA doesn't find our boost, so fix it.
+  # 2: Lion replacement for CGDisplayBitsPerPixel() taken from:
+  #   http://www.openscenegraph.org/projects/osg/changeset/12790/OpenSceneGraph/trunk/src/osgViewer/DarwinUtils.mm
+  #   https://github.com/mxcl/homebrew/issues/11391
+  #   Remove at >= 3.1.1
   def patches
     p = [DATA]
     p << "https://raw.github.com/gist/2890654/a07dec42b8451edf9edbf6468e5ae464c73b3b95/osg.diff" if build.stable?
+    return p
   end
 
   def install
-    args = %W{
-      ..
-      -DCMAKE_INSTALL_PREFIX='#{prefix}'
-      -DCMAKE_BUILD_TYPE=None
-      -Wno-dev
-      -DBUILD_OSG_WRAPPERS=ON
+    args = std_cmake_args + %w[
       -DBUILD_DOCUMENTATION=ON
-    }
+    ]
 
     if snow_leopard_64?
       args << "-DCMAKE_OSX_ARCHITECTURES=x86_64"
@@ -62,6 +57,7 @@ class OpenSceneGraph < Formula
     if Formula.factory('collada-dom').installed?
       args << "-DCOLLADA_INCLUDE_DIR=#{HOMEBREW_PREFIX}/include/collada-dom"
     end
+    args << '..'
 
     mkdir "build" do
       system "cmake", *args