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+cmake_minimum_required
+----------------------
+
+Set the minimum required version of cmake for a project and
+update `Policy Settings`_ to match the version given::
+
+  cmake_minimum_required(VERSION major.minor[.patch[.tweak]]
+                         [FATAL_ERROR])
+
+If the current version of CMake is lower than that required it will
+stop processing the project and report an error.
+
+The ``FATAL_ERROR`` option is accepted but ignored by CMake 2.6 and
+higher.  It should be specified so CMake versions 2.4 and lower fail
+with an error instead of just a warning.
+
+.. note::
+  Call the ``cmake_minimum_required()`` command at the beginning of
+  the top-level ``CMakeLists.txt`` file even before calling the
+  :command:`project` command.  It is important to establish version
+  and policy settings before invoking other commands whose behavior
+  they may affect.  See also policy :policy:`CMP0000`.
+
+  Calling ``cmake_minimum_required()`` inside a :command:`function`
+  limits some effects to the function scope when invoked.  Such calls
+  should not be made with the intention of having global effects.
+
+Policy Settings
+^^^^^^^^^^^^^^^
+
+The ``cmake_minimum_required(VERSION)`` command implicitly invokes the
+:command:`cmake_policy(VERSION)` command to specify that the current
+project code is written for the given version of CMake.
+All policies introduced in the specified version or earlier will be
+set to use NEW behavior.  All policies introduced after the specified
+version will be unset.  This effectively requests behavior preferred
+as of a given CMake version and tells newer CMake versions to warn
+about their new policies.
+
+When a version higher than 2.4 is specified the command implicitly
+invokes::
+
+  cmake_policy(VERSION major[.minor[.patch[.tweak]]])
+
+which sets the cmake policy version level to the version specified.
+When version 2.4 or lower is given the command implicitly invokes::
+
+  cmake_policy(VERSION 2.4)
+
+which enables compatibility features for CMake 2.4 and lower.