| 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 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`. |