I followed the tutorial on how to set up Dev-C++ for the Irrlicht engine, and some of the files it says to include in the parameters, from the /lib folder are not there, and when i code it is says that there is no such <irrlicht.h> folder in the directory.
Just take the project files from the SDK. These are much more recent and updated. There's a dev-cpp file for the engine, and several for the examples from which you can start your own project.