When using the vala binding (poppler-glib), compiling this https://live.gnome.org/Vala/PopplerSample example using gtk+-3.0 instead of gtk+-2.0 doesn't work anymore, because the .deps file of the binding specifically asks for gtk+-2.0, so there's a conflict between gtk2 and 3 when compiling. Editing the .deps file (substituting 2.0 with 3.0) makes it possibile to compile with gtk3, but raises conflicts with gtk2 obviously.
The vala bindings are shipped with vala, not with poppler.
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