Libgda and Libgnomedb's dependencies are kept to a minimum:
glib >= 2.12.0
GIO, Gamin >= 0.1.8 or FAM to monitor config. files alterations
Also to compile DBMS's providers, the DBMS's API's header files are needed (if not found, then the corresponding provider won't be compiled).
Libgda's UI extension
Gtk+ >= 2.12