I'm also stuck at the same point.

I've tried installing the Oracle 9i client in all of the available configurations, including going into custom and then selecting everything, but whatever I do the complaint about missing headers is the same.

Can anyone please shed some light on this?

NB I'm running this on SUSE Linux Enterprise Server 9, with the latest Perl and DBI successfully installed. Oracle client version is 9.2.0.1