(110612) -- JOHANNESBURG, June 12, 2011 (Xinhua) -- South African President Jacob Zuma (front) attends an extraordinary summit of the Southern African Development Community (SADC) to discuss Madagascar and Zimbabwe issues, in Johannesburg, South Africa, on June 11, 2011. Leaders from three major African blocs, the Southern African Development Community (SADC), the East African Community (EAC) and the Common Market for Eastern and Southern Africa (COMESA), will meet in Johannesburg on June 12 to seek an agreement to improve Africa's global economic competitiveness. (Xinhua/Yolande Snyman) (nxl)