You don't have to use Zeos, there are a couple of others, I think one is
mentioned right on the Lazarus home page.
The Zeos code will work on Delphi or Lazarus, it uses compiler
directives to detect if you are installing on Delphi or Lazarus.
I would suggest you go out to the zeos page on sourceforge and look in
the forums for help on this.
http://www.zeoslib.net
Zeos is by far the most advanced, it's pretty new for Lazarus, so it
might take some tweaking to get it to work.
I built PG Lightning Admin with Zeos and it works well on Delphi, but of
course your mileage will vary with Lazarus.
Hope this helps.
Tony Caduto
http://www.amsoftwaredesign.com
home of PG Lightning Admin (PGLA) for Postgresql 8.x