Summary: This article concerns the second-order differential equation with integral boundary conditions \[ \displaylines{ x''(t)=f(t,x(t),x'(t)),\quad t\in (0,1),\cr x(0)=\int_0^1x(s)d\alpha(s),\quad x(1)=\int_0^1x(s)d\beta(s). } \] Under resonance conditions, we construct a projector and then apply coincidence degree theory to establish the existence of solutions.