As a Nigerian Internet start up founderNote: I'm an American and not an expert on Nigeria. Still, my impression is that Nigeria doesn't have a very robust legal system or real property rights enforcement; when I think of law in Nigeria, I remember Ken Saro-Wiwa and the innumerable articles I've read about people fighting over oil spoils. (Once again: this could be wrong and Nigeria's legal system might be very good, with the Western press merely gravitating toward sensationalistic stories).
If you don't have a functioning legal system that enforces contracts (and a culture that respects contracts), I don't think you can have tech startup investments. If you have a high level of political risk, coups, and corruption, you're not going to get tech startup investments. Westerners have an unfair but real habit of lumping Africa together; when we read about the Zimbabwe disaster, for example, the possibility of political risk wiping out investment in other countries becomes very real.
One other commenter compared development to the technology stack, which is pretty astute.
It might also help to read William Easterly's paper, "Was the poverty of Africa determined in 1000 BC?": http://aidwatchers.com/2010/07/was-the-poverty-of-africa-det... . You might be running up against not just decades of difference in development, but centuries.