optionΒΆ
Provide an option that the user can optionally select.
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 CMP0077).
If you have options that depend on the values of other options, see
the module help for CMakeDependentOption.