@itemize
@item
This header file is missing on some platforms:
-mingw.
+mingw, MSVC 9.
+@item
+This header file is not self-contained (it requires @code{<sys/types.h>} to be
+included first) on some platforms:
+OpenBSD 4.4.
@end itemize
Portability problems not fixed by Gnulib: