option('deprecation_flags', type: 'boolean', value: false, description: 'use *_DISABLE_DEPRECATED flags')
option('session_selector', type: 'boolean', value: false, description: 'enable building a custom session selector dialog')
option('systemd', type: 'boolean', value: true, description: 'Use systemd')
option('systemd_journal', type: 'boolean', value:'true', description: 'Send log to systemd-journal')
option('consolekit', type: 'boolean', value: false, description: 'Use consolekit')
option('docbook', type: 'boolean', value: true, description: 'build documentation')
option('man', type: 'boolean', value: true, description: 'build documentation (requires xmlto)')