| 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 you have options that depend on the values of other options, see | |
| the module help for CMakeDependentOption. |