Turkish President Tayyip Erdogan arrives at the parliament to take the oath of office for a new presidential term, in Ankara, Turkey July 9, 2018.
The presidential aide stated that Buhari in the telephone conversation with Erdogan said he looked forward to the strengthening of relations between Nigeria and Turkey.
Monday's inauguration concluded the transition from a parliamentary system to an executive presidency, in line with the constitutional changes approved in a referendum in April 2017. He defeated a coalition of opposition parties in a snap election last month to hold onto power.
"Turkey is leaving behind a system which cost the country politically, socially, economically", Erdogan told the crowd, comprised also of dozens of foreign leaders and dignitaries.
The introduction of the new presidential system marks the biggest overhaul of governance since the Turkish republic was established on the ruins of the Ottoman Empire almost a century ago.
The president has promised to lift the emergency conditions later this month but in the hours before his swearing in he used to issue two more edicts.
Erdogan, who first came to power as premier in 2003, won 52.6 per cent of ballots cast in June, higher than the 51.79pc he garnered in the 2014 polls.
The post of prime minister has been scrapped and the president will now be able to select his own cabinet, regulate ministries and remove civil servants, all without parliamentary approval.
Erdogan's ruling Justice and Development Party (AKP) on Saturday nominated Yildirim as parliament speaker, an appointment likely to be rubber-stamped by the chamber on Thursday.
No major Western leader featured on a list of 50 presidents, prime ministers and other high-ranking guests published by state news agency Anadolu.
Since taking office in 2003, first as prime minister and later as president, Erdogan has dominated Turkey, tightening his grip over the country of 81 million people as he tamed rival power centres including the military, which toppled some previous governments. The coup was followed by a crackdown on members of the bureaucracy, judiciary, armed forces, police, media and academia, with more than 130,000 people dismissed from their jobs or arrested.