@item
The definition of @samp{LC_MESSAGES} is missing on some platforms:
mingw.
+
+@item
+The @code{locale_t} type is not defined on some platforms:
+glibc 2.11, MacOS X 10.5.
+
+@item
+Some platforms provide a @code{NULL} macro that cannot be used in arbitrary
+expressions:
+NetBSD 5.0
@end itemize
Portability problems not fixed by Gnulib: