option('xkb-base',
       type: 'string',
       value: '',
       description: 'XKB base path [default=$datadir/X11/xkb]')
option('compat-rules',
       type: 'boolean',
       value: true,
       description: 'create compatibility rules [default=true]')
option('xorg-rules-symlinks',
       type: 'boolean',
       value: true,
       description: 'create "xorg" symlinks to the "base" rules files [default=false]')