1: libc {
    2:   GLIBC_2.0 {
    3:     # global variables
    4:     __ctype_b; __ctype32_b; __ctype_tolower; __ctype_toupper;
    5:     _tolower; _toupper;
    6: 
    7:     # i*
    8:     isalnum; isalpha; isascii; isblank; iscntrl; isdigit; isgraph; islower;
    9:     isprint; ispunct; isspace; isupper; isxdigit;
   10: 
   11:     # t*
   12:     toascii; tolower; toupper;
   13:   }
   14:   GLIBC_2.2 {
   15:     # global variables
   16:     __ctype32_tolower; __ctype32_toupper;
   17:   }
   18:   GLIBC_2.3 {
   19:     isctype; __isctype;
   20: 
   21:     # functions used by optimized macros in ctype.h
   22:     __ctype_b_loc; __ctype_tolower_loc; __ctype_toupper_loc;
   23:   }
   24: }