ROKEN_LIB_VARIABLE
ROKEN_LIB_VARIABLE int opterr = 1; /* if error message should be printed */
ROKEN_LIB_VARIABLE int optind = 1; /* index into parent argv vector */
ROKEN_LIB_VARIABLE int optopt; /* character checked for validity */
ROKEN_LIB_VARIABLE char *optarg; /* argument associated with option */