[Vala] Compile failed because of libgee.

["G.S.Alex" <sthots gmail com>]

It seems that I've meet some problems with libgee.
The sample code works fine. But when I try to compile Vala toy for gedit and
Vala plugin for anjuta, it syas:

symbol.vala:23.7-23.9: error: The namespace name `Gee' could not be found
using Gee;
      ^^^

I've looked into the makefile.am and find that there is no " --pkg gee-1.0
". But when I add it manually ,  errors change to :

utils.vala:40.21-40.37: error: `ArrayList' is an ambiguous reference between
`Vala.ArrayList' and `Gee.ArrayList'
        var results = new ArrayList<string> ();
                          ^^^^^^^^^^^^^^^^^

Could anyone help me ? Thanks a lot.