@item
@samp{struct timeval} is not defined on some platforms.
@item
-@samp{struct timeval} is defined with an incompatible type for @code{tv_sec}
+@samp{struct timeval} is defined with a @code{tv_sec} type that is
+narrower than @code{time_t}
on some native Windows platforms:
mingw64 in 64-bit mode,
mingw64 in 32-bit mode when @code{__MINGW_USE_VC2005_COMPAT} is defined,
Portability problems not fixed by Gnulib:
@itemize
+@item
+@samp{struct timeval} is defined with a @code{tv_sec} type that is
+wider than @code{time_t}:
+OpenBSD 5.1 in 64-bit mode.
@end itemize