#define FLAG_SPACE 8 /* space flag */
#define FLAG_ALT 16 /* # flag */
#define FLAG_ZERO 32
+#if __GLIBC__ >= 2
+# define FLAG_LOCALIZED 64 /* I flag, uses localized digits */
+#endif
/* arg_index value indicating that no argument is consumed. */
#define ARG_NONE (~(size_t)0)