cannot find ISDL-ttf

Hi everyone, I'm learning about lazyfoo's tutorial,here's my small problem.
I'm using dev c++, I downloaded the ttf file and set as below´╝Ü

tools-> directory and add header file and lib file.

then project->project option->parameter then add linker -lSDL_ttf.

#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL_ttf.h"
#include <string>

when I compile, it said cannot find -ISDL_ttf , please help thanks a lot!
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