The guys that made postgres95 (now postgreSQL), have made some work on the
dl*() fucntions to work under Ultrix (!).  Don't know if this helps, but if it
does:

ftp://s2k-ftp.cs.berkeley.edu/pub/personal/andrew/dld-dec.tar.Z
--
Yiorgos Adamopoulos          -- Knowledge and Data Base Systems Laboratory
adamo@dbnet.ece.ntua.gr      -- National Technical University of Athens, GREECE