On platforms where @code{off_t} is a 32-bit type, @code{fseeko} does not work
correctly with files larger than 2 GB. The fix is to use the
@code{AC_SYS_LARGEFILE} macro.
+@item
+On platforms where @code{off_t} is a 64-bit type, but @code{fseeko} is
+not present, stream operations on files larger than 2 GB silently do
+the wrong thing. This affects BSD/OS, which is mostly obsolete.
@end itemize