option('notify', type: 'feature', value: 'disabled', description: 'Notifications using libnotify.' ) option('json', type: 'feature', value: 'auto', description: 'Dump configuration using JSON.' ) option('docs', type: 'feature', value: 'auto', description: 'Doxygen API documentation.' ) option('tests', type: 'feature', value: 'auto', description: 'run tests' )