Error compiling in DEV-C ++ (SDL)

I made the whole procedure to use SDL2, but when I compile the following error occurs:

[Error]SDL/SDL.h: No such file or directory

This is the content of the line where the error occurs

<SDL/SDL.h> 

What should I do ?? I researched a lot and found nothing that would solve my problem.

I've installed manual form

And by DevPak (DOWNLOAD )