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option
------
Provide an option that the user can optionally select.
.. code-block:: cmake
option(<variable> "<help_text>" [value])
Provides an option for the user to select as ``ON`` or ``OFF``.
If no initial ``<value>`` is provided, ``OFF`` is used.
If ``<variable>`` is already set as a normal or cache variable,
then the command does nothing (see policy :policy:`CMP0077`).
If you have options that depend on the values of other options, see
the module help for :module:`CMakeDependentOption`.
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