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It is shown how nonrelativistic QCD (NRQCD) can be used to determinenext-to-next-to-leading order relativistic and short-distance contributions tothe total $t\bar t$ production cross section in the threshold regime at leptoncolliders. A recipe for the calculation of all such contributions for the totalphoton mediated production cross section is presented and a review of thealready known Abelian next-to-next-to-leading results is given.Comment: Talk presented at the Workshop on Physics at the First Muon Collider  and the Front End of a Muon Collider, Fermilab, November 6-9, 1997, to appear  in the proceedings; 9 pages, latex, one ps figure include

Top quark pair production at threshold—uncertainties and relativistic corrections