In a nutshell. You become richer when you start producing shit that people want.
Yes, Africans have to start making things that people want. We can't keep talking about democracy, constitutions, amendments, elections while making nothing. The countries will just remain poor.
Why can't Africans make anything though? Lets start with Kenya. What do they manufacture that the rest of the world might need or want?
No factories? Still the variables are too many. HK tends to have a better grasp on the topic. But, yes, Africans for whatever the reason, are not producing things(beyond primary goods) that anyone values.