[Vala] What is "traversable" and how to use it !!! [since libgee 0.7]

[raum no-log org]

Hello,

I've compiled Libgee 0.8 (as usual with MingW under Windows ;)) and now
when I try to compile my project, I've got an error... =___= (greeeaat)

> objects.vala:257.1-257.55: error: cObjectsMap: some prerequisites
(`Gee.Traversable') are not met
> public class cObject : Object, Iterable<cObject> {
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Do you have a sample of code for this ? Because, due of lack of
documentation, I didn't understand exactly why now I need to use
"traversable".

Thanks :)

Raum

ps: to compile libgee, If you followed my previous messages
export GLIB_CFLAGS='-I /mingw/lib/glib-2.0/include -I
/mingw/include/glib-2.0 -I /mingw/include/glib-2.0/gobject '
export GLIB_LIBS='-lglib-2.0 -llibgobject-2.0'