If your friend wants to go around the world rather than a Europe-Africa-Australia return, he will need at least a four-continent xONE ticket, DONE4 (business) or AONE4 (first class). Refer to the two "sticky" threads at the top of this forum for guidelines on rules and pricing. Generally the cheapest prices for these tickets ex-Europe are from Eastern Europe or Egypt. Note the trip has to start from the country where ticketed, so he would need to go to that city first, even if only to pick up the tickets and continue on.