[syslog-ng] build problem on FreeBSD 7.2

Hi all, I'm trying to build v3.0.3 from source (with sql support) on a fresh install of FreBSD 7.2, and I have the following error when I lauch the make : "afsql.c:36:21: error: dbi/dbi.h: No such file or directory" I think I miss a library, something nedded for database support but I don't know what ? Could anymone help me ? Thanks a lot. Karl.