libc {

  GLIBC_2.0 {

    # global variables

    __ctype_b; __ctype32_b; __ctype_tolower; __ctype_toupper;

    _tolower; _toupper;

    # i*

    isalnum; isalpha; isascii; isblank; iscntrl; isdigit; isgraph; islower;

    isprint; ispunct; isspace; isupper; isxdigit;

    # t*

    toascii; tolower; toupper;

  }

  GLIBC_2.2 {

    # global variables

    __ctype32_tolower; __ctype32_toupper;

  }

  GLIBC_2.3 {

    isctype; __isctype;

    # functions used by optimized macros in ctype.h

    __ctype_b_loc; __ctype_tolower_loc; __ctype_toupper_loc;

  }

  GLIBC_PRIVATE {

    __ctype_init;

  }

}