Buildroot OpenGL Capable Backend

I'm trying to configure QT 5 through buildroot and some options are not available with the message requires an OpenGL-capable backend. I'm using buildroot 2013.08-rc1 but the same message comes up with 2013.05. I'm targeting x86_64 core2 platform and I can't find any options to select OpenGL backend (or OpenGL anything actually). How can I enable OpenGL backend in buildroot?