SDL2/SDL.H file not found - c++

Question

I'm following this tutorial on youtube:
https://www.youtube.com/watch?v=44tO977slsU
and he links a video on how to install SDL2, I follow that video, and I followed this one as well. But when I compile it keeps coming up with SDL2/SDL not found? I'm not sure how to fix this
Here is my code so far
MAIN.CPP
#include "Game.hpp"
Game *game =nullptr;
int main(int argc, const char * argv[]) {
game = new Game();
game->init("Nijigen-Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, false);
while (game->running()) {
game->handleEvents();
game->update();
game->render();
}
game->clean();
return 0;
}
Game.cpp
#include "Game.hpp"
Game::Game()
{}
Game::~Game()
{}
void Game::init(const char *title, int xpos, int ypos, int width, int height, bool fullscreen)
{
int flags = 0;
if(fullscreen)
{
flags = SDL_WINDOW_FULLSCREEN;
}
if(SDL_Init(SDL_INIT_EVERYTHING) == 0)
{
std::cout << "Subsystems Initiated!..." << std::endl;
window = SDL_CreateWindow(title, xpos, ypos, width, height, flags);
if(window)
{
std::cout << "Window Created!..." << std::endl;
}
renderer = SDL_CreateRenderer(window, -1, 0);
if(renderer)
{
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
std::cout << "Renderer Created!..." << std::endl;
}
isRunning = true;
} else {
isRunning = false;
}
}
void Game::handleEvents()
{
SDL_Event event;
SDL_PollEvent(&event);
switch (event.type) {
case SDL_QUIT:
isRunning = false;
break;
default:
break;
}
}
void Game::update()
{}
void Game::render()
{
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
}
void Game::clean()
{
SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
SDL_Quit();
std::cout << "Game Cleaned" << std::endl;
}
** And Game.hpp**
#ifndef Game_hpp
#define Game_hpp
#include "SDL2/SDL.h"
#include <iostream>
class Game {
public:
Game();
~Game();
void init(const char* title, int xpos, int ypos, int width, int height, bool fullscreen);
void handleEvents();
void update();
void render();
void clean();
bool running() { return isRunning; }
private:
bool isRunning;
SDL_Window *window;
SDL_Renderer *renderer;
};
#endif /* Game_hpp */