Full Idea
Hursthouse defines a virtue as a trait humans need to flourish or live well, ...so 'eudaimonia' is conceptually foundational, the concept of virtue is then derived, and the concept of a right act is derived from that.
Gist of Idea
Eudaimonia first; virtue is a trait which promotes it; right acts are what virtues produce
Source
report of Rosalind Hursthouse (Virtue Theory and Abortion [1992], p.226) by Linda Trinkaus Zagzebski - Virtues of the Mind II.1
A Reaction
Zagzebski is mapping different types of virtue theory. The purest theories say that virtue is intrinsically good. The others seem to be instrumental, in varying degrees. Zagzebski makes good motivations prior.
Book Reference
Zagzebski,Linda: 'Virtues of the Mind' [CUP 1996], p.81