President Salva Kiir and key South Sudanese opposition leaders without exception have appended their signature on the agreements on governance on Sunday putting aside their concerns over the power-sharing and number of states.
Presidents Yoweri Museveni (Uganda), Ismael Omar Guelleh (Djobouti), host Omar al-Bashir and Somalia Prime Minister Hassan Ali Khayre witnessed the signing of the peace pact.
Thousands of South Sudanese were massed outside the Friendship Hall in Khartoum to celebrate the peace deal.
African political and social figures are today awaiting the arrival of the two main contenders in the South-Sudan war to the signing ceremony of the agreement that will put an end to the civil war that opposes them. "The agreement is in place and we will remain committed. and will implement (it)", he said.
"The 2015 (deal) was forced on us, we were not given the opportunity to express our desire".
The agreement outlines guidelines on power-sharing and governance, including settling boundary disputes, which will be guided by a Boundary Commission, and provides for an avenue for the people of South Sudan to participate in a referendum if need be to settle those disputes. This is why when I came sign.
It began when Mr Kiir fired his then deputy Mr Machar, accusing him of planning a coup - an allegation he denied.
The power-sharing deal stipulates that there will be 35 ministers in the bloated transitional government, including 20 Kiir allies and nine backers of Machar along with representatives of other rebel factions.
"I would urge. IGAD to focus after this on the implementation of the agreement", Machar said in his address.
A similar arrangement fell apart in July 2016 when fighting erupted in the capital, Juba, and Machar fled the country.
With the country's agricultural sector severely disrupted, seven million South Sudanese - more than half of the population - will need food aid in 2018, the United Nations says.