8 conditions for a sammasambuddha

Eight conditions for a samma-sam-buddha, according to Khuddaka Nikaya, Buddhavamsa 2.59:

1. Manussatta: the human state. The resolve to become a Sammāsambuddha can be made only during a life in which one is a human being.
2. Liṅgasampatti: possession of the right sex. One must be a man, not a woman, a congenital eunuch, or a hermaphrodite.
3. Hetu: cause. Possessing the supporting conditions for attaining arahantship in that same life, if he were to exert himself towards this end.
4. Satthāradassana: the sight of the Teacher. This means an encounter with a Sammāsambuddha, as when Sumedha met the Buddha Dīpaṅkara and declared his resolve in his presence.
5. Pabbajjā: going forth into the homeless life. One must have left the household life and be an ascetic who holds to the doctrine of the efficacy of kamma, like the ascetic Sumedha when he made his resolve.
6. Guṇasampatti: attainment of special qualities. One must have attained special or distinctive qualities, beginning with the jhānas, like Sumedha, who had attained the five mundane higher knowledges (abhiññā) and the eight attainments (samāpatti) when he made his resolve before the Buddha Dīpaṅkara.
7. Adhikāra: extreme dedication. At the time of making one's resolve to become a Sammāsambuddha one must be prepared to sacrifice everything, even one's life.
8. Chandatā: strong desire. Having a strong desire to become a Sammāsambuddha, no matter how great the difficulties and obstacles one may encounter. For example, if he were told that to attain sammāsambodhi it would be necessary to tread his way across an entire world-system filled with flameless hot coals, or tread his way across an entire world-system whose ground was bespread with spears and sharp-pointed bamboo sticks, or wade across an entire world-system filled with water, or cut his way through an entire world-system choked with thorny bamboo plants, — he would reply: "I can do that."