Nigeria has so much petroleum and gas and there are quite a number of engine types that can run easily off of raw unprocessed flare gases in the crude oil fields.
Stirling engines are very simple and simply need a flame to heat it. Oil fields in Nigeria flare/burn in flames the gas emmissions from the oil tapping sites. It is just burned into the air with no use at all.
Imagine each flare site having a stirling engine attached? Some regular engines will also run on those flare fumes. All enough to drive electricity producing turbines.
Everything is there to make it happen easily. But no application is made. Stirling engines may not be very efficient but they are easy to power and are a great way to harness raw burning of resources already being wasted. They are simple and easy to maintain and possible to manufacture in Nigeria with ease. They can use heat from your cooking stove as you cook, or heat from another petrol burning engine or even from the sun. They are extremely versatile.
Here is an example of a small scale sterling engine.

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https://www.youtube.com/watch?v=_51swDURjO0


They are not powerful enough to make a competitive car engines but they are sufficient for turning small turbines to make electricity with the most simple application of fuel combustion or collected heat from any source such as the sun or geo thermal. Very simple engines that can easily be made and maintained by Nigerians in Nigeria.
Here is a video of a stirling engine being used in a small vehicle.

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https://www.youtube.com/watch?v=qS5x91CZbtY

How it works at the most basic level. There are a few design types and also multiple cylinder engines

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https://www.youtube.com/watch?v=DVOJ-SAOqJQ


And just to prove how easy it is to make, here is an example of a design made using only waste materials that can all be found in Nigeria, including the N50 kerosene candle used to power it. Imagine getting a welder, panel beater and vulcanizer together to make a serious large scale model and using old discarded parts from extinct automobiles.

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https://www.youtube.com/watch?v=KPZ1Dmg9JAg