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CMP0077
-------
:command:`option` honors normal variables.
The ``OLD`` behavior for this policy is to clear any existing normal variables
with the same name. The ``NEW`` behavior for this policy is to not create
a cache entry or modify any existing normal variables if a normal variable
with the same name already exists.
This policy was introduced in CMake version 3.13. CMake version
|release| warns when the policy is not set and uses ``OLD`` behavior.
Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW``
explicitly.
.. include:: DEPRECATED.txt
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