Documentation / technical / api-xdiff-interface.txton commit pre-POSIX.1-2001 systems do not have <sys/select.h> (2600973)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)