What indications are there that Paulo Coelho's The Alchemist could be considered an existentialist piece of literature?

A
philosophy is defined as a pursuit of wisdom. Early philosophical theory maintains
that existentialism is the concept...

...that the individual is solely responsible for giving his or her own life meaning and
for living that life passionately and sincerely in spite of many existential obstacles and
distractions including despair, angst, absurdity, alienation, and boredom.

This responsibility of the individual, according to the early
19thcentury philosopher S¸ren Kierkegaard, remains even in face of the obstacles life places
in one's path. Later existentialists still saw the importance of the individual, but observed
that there were factors that influenced a person's choices: among these were the belief in the
existence or non-existence of God.

With these things in mind, it is safe to
assume that there areexistential aspects in
Paulo Coelho's  . Demonstrations of the value of an individual's choices
are seen with what Santiago...