5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/wctype.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
15 This function is declared in @code{<wchar.h>}, not in @code{<wctype.h>}, on
20 Portability problems not fixed by Gnulib:
23 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
24 accommodate all Unicode characters.