rem: exit_cleanup(RERR_UNSUPPORTED);
context: void option_error(void){	if (err_buf[0]) {		rprintf(FLOG,"%s", err_buf);		rprintf(FERROR,"%s", err_buf);	} else {		rprintf(FLOG,"Error parsing options - unsupported option?\n");		rprintf(FERROR,"Error parsing options - unsupported option?\n");	}	exit_cleanup(RERR_UNSUPPORTED);}