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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.
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