PHP4 Compile using Informix Client SDK

Hi, I have SuSe Linux v7.2 with working versions of Apache and MySQL. The problem now is that I need to access an Informix Online v7.3 database running on a separate AIX server. This server has I-Net serving ODBC calls from Windows PC's. I've downloaded the Linux version of the Informix Client SDK and installed it. What happens next? From looking at the documentation (which isn't too clear), it looks as though I need to compile the ODBC libraries directly into PHP. How do I do that? Which libraries should I use? Could I use iODBC to act as a front end? I used this on a different site where I had Openlink ODBC installed. Could I use Openlink ODBC clients to go across I-Net? If anyone could help, I'd be most grateful. Thanks in advance. Regards, Paul