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option
------
Provides an option that the user can optionally select.
::
option(<option_variable> "help string describing option"
[initial value])
Provide an option for the user to select as ``ON`` or ``OFF``. If no
initial value is provided, ``OFF`` is used. If the option is already
set as a normal 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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