http://www.dhammawiki.com/index.php?tit ... uddhism_in
Several years ago I started an informal online group to see if there would be interest in promoting the Dharma in Africa, specifically in Ethiopia to start.
The group grew a little and I was somewhat surprised to see the interest in Buddhism from some Ethiopians. Labor and materials were pretty cheap, so even considered having a temple / Dharma center built. But there was also resistance from some who saw it as just another white man coming to tell the Africans how to worship. They didn't word it quite like that, but something to that effect. Additionally, I found out the Ethiopian government has a policy of not allowing any "new" religions into the country. They have limited it to Christianity, Judaism, and Islam. So I eventually had to drop the plan.
I think the way it may eventually develop is in a similar way it arrived to the U.S. and other Western nations -- through the immigrant-Asian communities. There are immigrant Asian communities in virtually every country, including in the African countries. For the most part, most nations allow them to practice their religions and to build temples for their communities. And then later at some time, the Africans, perhaps out of curiosity or their own studies, may come to the temple.
Another big way it could develop is through monks of African birth (rather than an outsider) such as Venerable Bhante Buddharakkhita who was born and raised in Uganda, Africa.http://www.ugandabuddhistcenter.org/