@item
This function is missing on some platforms:
NetBSD 3.0, OpenBSD 3.8, OSF/1 5.1, Solaris 2.4, Cygwin, mingw, Interix 3.5, BeOS.
+@item
+On platforms where @code{off_t} is a 32-bit type, this function may not
+work correctly on files larger than 2 GB. The fix is to use the
+@code{AC_SYS_LARGEFILE} macro.
@end itemize