Help: Gnome Build Framework

Hi all,

I'm using libgbf in a simple Gedit plugin, but I can't figure how (if) I 
can add a "package" (a library) to an existing configure.[ac|in] script 
with libgbf itself.

Is it possibile? From the header I see that I can add sources or targets 
or groups, but no packages....

Cheers,
Andrea