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+CMP0000
+-------
+
+A minimum required CMake version must be specified.
+
+CMake requires that projects specify the version of CMake to which
+they have been written. This policy has been put in place so users
+trying to build the project may be told when they need to update their
+CMake. Specifying a version also helps the project build with CMake
+versions newer than that specified. Use the cmake_minimum_required
+command at the top of your main CMakeLists.txt file:
+
+::
+
+ cmake_minimum_required(VERSION <major>.<minor>)
+
+where "<major>.<minor>" is the version of CMake you want to support
+(such as "2.6"). The command will ensure that at least the given
+version of CMake is running and help newer versions be compatible with
+the project. See documentation of cmake_minimum_required for details.
+
+Note that the command invocation must appear in the CMakeLists.txt
+file itself; a call in an included file is not sufficient. However,
+the cmake_policy command may be called to set policy CMP0000 to OLD or
+NEW behavior explicitly. The OLD behavior is to silently ignore the
+missing invocation. The NEW behavior is to issue an error instead of
+a warning. An included file may set CMP0000 explicitly to affect how
+this policy is enforced for the main CMakeLists.txt file.
+
+This policy was introduced in CMake version 2.6.0.