Yes, user acs, database acs.
As far as your other question goes, the make file might make postgres.so, and perhaps I just copied the binary to nspostgres.so? I think the AOLserver3 docs refer to nspostgres.so and the binary distribution has it named nspostgres.so.
My machine with all this on it isn't reachable at the moment, so I can't check and don't feel like downloading sources at the moment...