Well, I think that Africans, like Latin Americans or any other non-european group must generate their own validation.
We can't expect validation to come from outside sources. I know it is difficult, for instance, to get things published and circulated, but if efforts are made to invest in the difusion and discussion of each culture's particular epistemologies and ontologies from within and towards a wider audience (taking advantage of today's tech resources), then we can make alternative conceptions of knowledge and the world as ubiquitous as mainstream western thought.