Uganda's President Yoweri Museveni signed on Sunday the East African Crude Oil Pipeline project agreement with his Tanzanian counterpart Samia Hassan Suluhu.
Nigeria, Africa's biggest economy, entered recession for the second time in four years, after a contraction in its gross domestic product for a second consecutive quarter.
Thousands of people have marched through the Mauritian capital, Port Louis, in protest at the authorities' handling of a massive oil spill, and the discovery of 39 dead dolphins.
As salvage teams rush to pump oil out of a Japanese-owned ship grounded off the coast of Mauritius, politicians on shore are starting to spread the blame.
Libya's national oil company says it has resumed its vitally important exports after a halt of nearly six months, caused by conflict and political upheaval.