Gtk +2.x symbols detected. using gtk+ 2.x and gtk+3 in the same process is not ...

I use eclipse in ububntu 12.04. I installed Opencv. Then I saw the error in eclipse in a project that was working well before the installation: Gtk +2.x symbols detected. using gtk+ 2.x and gtk+3 in the same process is not supported
Anyone knows how I can solve it?