option('nls', type : 'boolean', value : true, description : 'Native language support') option('thumbnailer', type : 'boolean', value: true) option('gdk-pixbuf-thumbnailer', type : 'boolean', value: true, description: 'Use gdk-pixbuf-thumbnailer') option('xmp', type : 'feature', description : 'Special XMP support') option('libexif', type : 'feature', description : 'EXIF support') option('cms', type : 'feature', description : 'Colour management support') option('jpeg', type : 'feature', description : 'Special JPEG support') option('librsvg', type : 'feature', description : 'RSVG support')