Portability problems fixed by Gnulib:
@itemize
+@item
+The type @code{off_t} is missing on some platforms:
+glibc 2.8 and others.
+@item
+The type @code{ssize_t} is missing on some platforms:
+glibc 2.8, MacOS X 10.5, Solaris 10, and others.
+@item
+The type @code{va_list} is missing on some platforms:
+glibc 2.8, OpenBSD 4.0, Solaris 10, and others.
+@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: