  We present constraints on the CKM parameter gamma=arg(Vub*) formed within the
framework of SU(3) symmetry and based on charmless hadronic B decays to K*+-
pi-+ and other pseudoscalar-vector final states. For strong phases of O(10
degrees), our analysis weakly favors cos(gamma)<0. We also estimate that a
determination of $\gamma$ with an experimental uncertainty of less than
$10^\circ$ can be attained with an order-of-magnitude improvement in the
precision of the experimental inputs, but SU(3) symmetry breaking could
introduce corrections approaching the size of the current experimental
uncertainties.
