participating in the meeting were egyptian president muhammad husni mubarak , the current chairman of oau ; president robert mugabe of zimbabwe , president of the host country and head of the front-line states ; botswana 's president ketumile masire , cape verde 's president antonio mascarenhas , ethiopian president meles zenawi , mozambique 's president chissano , namibian president dr. sam nujoma , tanzanian president ali hassan mwinyi , and zambian president frederick chiluba .