diff --git a/CMakeLists.txt b/CMakeLists.txt
index 215f65aa7..2cec2d276 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(Eigen)
-set(EIGEN_VERSION_NUMBER "2.0-beta3")
+set(EIGEN_VERSION_NUMBER "2.0-beta4")
 
 #if the svnversion program is absent, this will leave the SVN_REVISION string empty,
 #but won't stop CMake.
@@ -12,7 +12,7 @@ else(EIGEN_SVN_REVISION)
   set(EIGEN_VERSION "${EIGEN_VERSION_NUMBER}")
 endif(EIGEN_SVN_REVISION)
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.6.2)
 
 set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 3160ce7f6..af473ca32 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -28,6 +28,14 @@
 
 #undef minor
 
+#define EIGEN_WORLD_VERSION 2
+#define EIGEN_MAJOR_VERSION 0
+#define EIGEN_MINOR_VERSION 0
+
+#define EIGEN_VERSION_AT_LEAST(x,y,z) (EIGEN_WORLD_VERSION>x || (EIGEN_WORLD_VERSION>=x && \
+                                      (EIGEN_MAJOR_VERSION>y || (EIGEN_MAJOR_VERSION>=y && \
+                                                                 EIGEN_MINOR_VERSION>=z))))
+
 #ifdef EIGEN_DEFAULT_TO_ROW_MAJOR
 #define EIGEN_DEFAULT_MATRIX_STORAGE_ORDER_OPTION Matrix_RowMajor
 #else
diff --git a/bench/btl/CMakeLists.txt b/bench/btl/CMakeLists.txt
index b6afc86ed..3f44e7c70 100644
--- a/bench/btl/CMakeLists.txt
+++ b/bench/btl/CMakeLists.txt
@@ -1,6 +1,6 @@
 PROJECT(BTL)
 
-CMAKE_MINIMUM_REQUIRED(VERSION 2.4)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.2)
 
 set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 include(MacroOptionalAddSubdirectory)