undefined reference to 'SDL_xxxxx'

Question

I had the issue undefined reference to SDL_Init'` and more them with same typo.

This is my code

#include <stdio.h>
#include <SDL.h>
#include <SDL_image.h>
#include <iostream>

#define WIDTH 1280
#define HEIGHT 720

int main(int argc, char *argv[])
{

    // variable declarations
    SDL_Window *win = NULL;
    SDL_Renderer *renderer = NULL;
    SDL_Texture *img = NULL;

    // Initialize SDL.
    if (SDL_Init(SDL_INIT_VIDEO) < 0)
        return 1;

    // create the window and renderer
    // note that the renderer is accelerated
    win = SDL_CreateWindow("Image Loading", 0, 78, WIDTH, HEIGHT, 0);
    renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);

    // load our image
    img = IMG_LoadTexture(renderer, "C:/Users/BoostMyTool/Desktop/image.jpg");
    if (img == nullptr)
    {
        std::cout << "IMG_LoadTexture Error: " << SDL_GetError() << "\n";
        return 1;
    }

    int w, h;                                  // texture width & height
    SDL_QueryTexture(img, NULL, NULL, &w, &h); // get the width and height of the texture
    // put the location where we want the texture to be drawn into a rectangle
    // I'm also scaling the texture 2x simply by setting the width and height
    SDL_Rect texr;
    texr.x = 0;
    texr.y = 0;
    texr.w = w;
    texr.h = h;

    unsigned int lastUpdateTime = 0;

    // main loop
    while (1)
    {

        // event handling
        SDL_Event e;
        if (SDL_PollEvent(&e))
        {
            if (e.type == SDL_QUIT)
                break;
            else if (e.type == SDL_KEYUP && e.key.keysym.sym == SDLK_ESCAPE)
                break;
        }

        // paint the image once every 30ms, i.e. 33 images per second
        if (lastUpdateTime + 30 < SDL_GetTicks())
        {
            lastUpdateTime = SDL_GetTicks();

            // clear the screen
            SDL_RenderClear(renderer);
            // copy the texture to the rendering context
            SDL_RenderCopy(renderer, img, NULL, &texr);
            // flip the backbuffer
            // this means that everything that we prepared behind the screens is actually shown
            SDL_RenderPresent(renderer);
        }
    }

    SDL_DestroyTexture(img);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(win);

    return 0;
}

This is my makefile code

execute: main programme doexe
main:
    g++ -I "./include/SDL2" -c ./src/main.cpp -o ./lib/main.o
programme:
    g++ ./lib/main.o -o ./bin/programme
doexe:
    ./bin/programme.exe

When I write mingw32-make to the cmd it gaves an error which is

g++ -I "./include/SDL2" -c ./src/main.cpp -o ./lib/main.o
g++ ./lib/main.o -o ./bin/programme
./lib/main.o:main.cpp:(.text+0x27): undefined reference to `SDL_Init'
./lib/main.o:main.cpp:(.text+0x6c): undefined reference to `SDL_CreateWindow'
./lib/main.o:main.cpp:(.text+0x8a): undefined reference to `SDL_CreateRenderer'
./lib/main.o:main.cpp:(.text+0xa0): undefined reference to `IMG_LoadTexture'
./lib/main.o:main.cpp:(.text+0xae): undefined reference to `SDL_GetError'
./lib/main.o:main.cpp:(.text+0x113): undefined reference to `SDL_QueryTexture'
./lib/main.o:main.cpp:(.text+0x13f): undefined reference to `SDL_PollEvent'
./lib/main.o:main.cpp:(.text+0x16f): undefined reference to `SDL_GetTicks'
./lib/main.o:main.cpp:(.text+0x17d): undefined reference to `SDL_GetTicks'
./lib/main.o:main.cpp:(.text+0x18b): undefined reference to `SDL_RenderClear'
./lib/main.o:main.cpp:(.text+0x1ac): undefined reference to `SDL_RenderCopy'
./lib/main.o:main.cpp:(.text+0x1b7): undefined reference to `SDL_RenderPresent'
./lib/main.o:main.cpp:(.text+0x1cb): undefined reference to `SDL_DestroyTexture'
./lib/main.o:main.cpp:(.text+0x1d6): undefined reference to `SDL_DestroyRenderer'
./lib/main.o:main.cpp:(.text+0x1e1): undefined reference to `SDL_DestroyWindow'
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libmingw32.a(main.o):(.text.startup+0xa0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
Makefile:5: recipe for target 'programme' failed
mingw32-make: *** [programme] Error 1

I tried to get my code step by step .o then .exe and execute .exe

I tried to add -lmylib to my begining of my makefile commands but it caused ** cannot find <SDL.h> or it didn't done anyting

I am going to look for a mingw64.