@itemize
@item
This function is missing on some platforms:
-HP-UX 11.00, IRIX 6.5, Solaris 2.6, Cygwin, Interix 3.5, BeOS.
+HP-UX 11.00, IRIX 6.5, Solaris 2.6, Cygwin 1.5.x, Interix 3.5, BeOS.
@item
On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
accommodate all Unicode characters.