option('purple-version', type : 'combo', choices : ['2', '3'], value : '2',
description : 'set to 3 to compile against libpurple3')
option('types', type : 'string', value : 'default',
description : 'comma-separated list of plugin types to build: default, abusive, incomplete, or all')
option('nls', type : 'boolean', value : true,
description : 'enable installation of translation files')
