1option 2------ 3 4Provide an option that the user can optionally select. 5 6.. code-block:: cmake 7 8 option(<variable> "<help_text>" [value]) 9 10Provides an option for the user to select as ``ON`` or ``OFF``. 11If no initial ``<value>`` is provided, ``OFF`` is used. 12If ``<variable>`` is already set as a normal or cache variable, 13then the command does nothing (see policy :policy:`CMP0077`). 14 15If you have options that depend on the values of other options, see 16the module help for :module:`CMakeDependentOption`. 17