This is for Ogre v2, aka. Ogre-next.
See this article for a step-by-step explanation of this setup.
This repository includes Ogre and other dependencies as submodules. To clone properly:
git clone --recurse-submodules https://github.com/makuto/ogre-start-project
# Or, if you've already cloned without --recurse-submodules:
git submodule update --init --recursive
You may also need to do this:
cd Dependencies/ogre-next-deps
git submodule update --init --recursive