-On platforms where @code{off_t} is a 32-bit type, @code{fseek} does not work
-correctly with files larger than 2 GB. The fix is to use fseeko instead.
+On platforms where @code{long} is a 32-bit type, @code{fseek} does not work
+correctly with files larger than 2 GB. The fix is to use @code{fseeko}
+instead and to invoke the @code{AC_SYS_LARGEFILE} macro.