You have to have installed cmake!
Clone and cd into repo
git clone https://github.com/Lukasz825700516/cardboard_game_engine.git
cd cardboard_game_engine
Create build directory, and cd into it
mkdir build
cd build
Create project using cmake
Cardboard will in future support multiple rendering targets, so you need to specify one
cmake .. -DCARDBOARD_GRAPHICS_TARGET=opengl -DCARDBOARD_WINDOWS_TARGET=glfw
And then build it, with thing that cmake has generated for you
On *nix it will probably be make, on windows VisualStudio I guess...
make cardboard_game_engine