PostgreSQL on AIX

I am interested in using PostgreSQL on IBM AIX 4.1 ....4.3

I am using it to post from legacy(non- SQL based) applications on the AIX
that I will have access to the source code.  The applications work great and
I'm looking only to add functionality(Web access). I will be using
Asta(www.astatech.com) in Delphi applications to access a web database as
well as the database that is to be created in PostgreSQL on the IBM AIX.

My thought is to insert calls into the legacy programs. These calls will
send onfo to new programs(perl, java or other). The new programs will then
pass the varialbes as parameters and Post/insert/delete/etc the PostgreSQL
database.

When do I start.

Thanks,
Rick Vlahov