option('gtk_doc', type: 'boolean', value: false, description: 'Whether to generate the API reference for Calls') option('tests', type: 'boolean', value: true, description: 'Whether to compile unit tests') option('manpages', type: 'boolean', value: true, description: 'Whether to generate man pages') option('gst_debug', type: 'boolean', value: true, description: 'Whether to use gstreamers debugging API') option('systemd_user_unit_dir', type: 'string', value: '', description: 'Directory for systemd user units')