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+@node iswblank
+@section @code{iswblank}
+@findex iswblank
+
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/iswblank.html}
+
+Gnulib module: iswblank
+
+Portability problems fixed by Gnulib:
+@itemize
+@item
+This function is missing on some platforms:
+Minix 3.1.8, AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw, MSVC 9.
+@item
+This function is declared but not defined on some platforms:
+IRIX 6.5.30.
+@item
+This function is not declared (without @code{-D_GNU_SOURCE}) on some platforms:
+glibc 2.8.
+@item
+This function returns 0 for all possible arguments on some platforms:
+Linux libc5.
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@item
+On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
+accommodate all Unicode characters.
+@end itemize