option('benchmarks', type: 'boolean', value: false, description: 'Build benchmarks') option('examples', type: 'boolean', value: false, description: 'Build examples') option('tests', type: 'boolean', value: false, description: 'Build unit tests') option('jpeg', type: 'feature', value: 'auto', description: 'Enable JPEG compression') option('tls', type: 'feature', value: 'auto', description: 'Enable encryption & authentication') option('nettle', type: 'feature', value: 'auto', description: 'Enable nettle low level encryption library') option('systemtap', type: 'boolean', value: false, description: 'Enable tracing using sdt') option('gbm', type: 'feature', value: 'auto', description: 'Enable GBM integration') option('h264', type: 'feature', value: 'auto', description: 'Enable open h264 encoding') option('experimental', type: 'boolean', value: false, description: 'Enable experimental features')