MARIKE DE KLERK, ex-wife of former president FW de Klerk, did not marry her fianc Johann Koekemoer on Saturday as originally planned. Afrikaans Sunday paper Rapport reported that the wedding was postponed after Koekemoer was admitted to a Pretoria hospital with a nervous condition. The paper quoted De Klerk as saying that their relationship is going well anmd that they will marry when they are ready, but would not elaborate. The couple announced their engament at the end of July.