Moral dilemmas are not a local issue

It is sometimes claimed that the Kantian Ought Implies Can principle (OIC) rules out the possibility of moral dilemmas. A certain understanding of OIC does rule out the possibility of moral dilemmas in the sense defined. However I doubt that this particular formulation of the OIC principle is one that fits well with the eudaimonist framework common to ancient Greek moral philosophy. In what follows, I explore the reasons why Aristotle would not accept the OIC principle in the form in which it rules out the possibility of moral dilemmas.