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+cmake_minimum_required
+----------------------
+
+Require a minimum version of cmake.
+
+.. code-block:: cmake
+
+  cmake_minimum_required(VERSION <min>[...<max>] [FATAL_ERROR])
+
+Sets the minimum required version of cmake for a project.
+Also updates the policy settings as explained below.
+
+``<min>`` and the optional ``<max>`` are each CMake versions of the form
+``major.minor[.patch[.tweak]]``, and the ``...`` is literal.
+
+If the running version of CMake is lower than the ``<min>`` required
+version it will stop processing the project and report an error.
+The optional ``<max>`` version, if specified, must be at least the
+``<min>`` version and affects policy settings as described below.
+If the running version of CMake is older than 3.12, the extra ``...``
+dots will be seen as version component separators, resulting in the
+``...<max>`` part being ignored and preserving the pre-3.12 behavior
+of basing policies on ``<min>``.
+
+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 range of CMake versions.
+All policies known to the running version of CMake and introduced
+in the ``<min>`` (or ``<max>``, if specified) version or earlier will
+be set to use ``NEW`` behavior.  All policies introduced in later
+versions 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 ``<min>`` version higher than 2.4 is specified the command
+implicitly invokes
+
+.. code-block:: cmake
+
+  cmake_policy(VERSION <min>[...<max>])
+
+which sets CMake policies based on the range of versions specified.
+When a ``<min>`` version 2.4 or lower is given the command implicitly
+invokes
+
+.. code-block:: cmake
+
+  cmake_policy(VERSION 2.4[...<max>])
+
+which enables compatibility features for CMake 2.4 and lower.