Using continuation theorems of Leray-Schauder degree theory, we obtain existence results for the first order quasilinear boundary value problem (phi(u))' = f(t, u), u(T) = bu(0), where phi : R -> (-a, a) is an homeomorphism such that phi(0) = 0 and f : [0, T] x R -> R is a continuous function, a and T being positive real numbers and b some non zero real number.