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+cmake_minimum_required
+----------------------
+
+Set the minimum required version of cmake for a project.
+
+::
+
+  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.  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.
+
+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.