Election: two or more presidential candidates
Section 134(5) · 1999 Constitution (2004 edition)
What Constitution says
(5) In default of a candidate duly elected under subsection (4) of this section, the Independent National Electoral Commission shall, within seven days of the result of the election held under the aforesaid subsection (4), arrange for another election between the two candidates to which the subsection relates and a candidate at such election shall be deemed to have been duly elected to the office of President, if he has a majority of the votes cast at the election.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 68. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections