When I build my simple project including SDL only, it works fine and an executable is produced. However, as soon as I include sdl_image, mixer or ttf the executable is not produced. I reckon it’s because certain dependencies are not installed, but they should be after running git submodule init update --recursive right?

cmake_minimum_required(VERSION 3.5)
project(Beluga)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

# This assumes you have added SDL as a submodule in external/SDL
add_subdirectory(external/SDL EXCLUDE_FROM_ALL)
# add_subdirectory(external/SDL_image EXCLUDE_FROM_ALL)
# add_subdirectory(external/SDL_mixer EXCLUDE_FROM_ALL)
# add_subdirectory(external/SDL_ttf EXCLUDE_FROM_ALL)

# Create your game executable target as usual
add_executable(Beluga src/main.cpp)

# Link to the actual SDL3 library.
target_link_libraries(Beluga PRIVATE
    SDL3::SDL3
   # SDL3_image::SDL3_image
   # SDL3_mixer::SDL3_mixer
   # SDL3_ttf::SDL3_ttf
)

[submodule "external/SDL"]
    path = external/SDL
    url = https://github.com/libsdl-org/SDL
[submodule "external/SDL_image"]
    path = external/SDL_image
    url = https://github.com/libsdl-org/SDL_image
[submodule "external/SDL_mixer"]
    path = external/SDL_mixer
    url = https://github.com/libsdl-org/SDL_mixer
[submodule "external/SDL_ttf"]
    path = external/SDL_ttf
    url = https://github.com/libsdl-org/SDL_ttf

    #include <SDL3/SDL.h>

    int main( int argc, char* argv[] )
    {
        const int WIDTH = 640;
        const int HEIGHT = 480;
        SDL_Window* window = NULL;
        SDL_Renderer *renderer = NULL;
        
        SDL_EVENT_QUIT == false;
        SDL_Init(SDL_INIT_VIDEO);
        window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, 0);
        renderer = SDL_CreateRenderer(window, NULL);
        

    if (SDL_EVENT_QUIT == true){
        SDL_DestroyRenderer(renderer);
        SDL_DestroyWindow(window);
        SDL_Quit();
        return 0;
    }
        
    }

After including sdl_image, I expected a .exe files to be generated after building, but no executable…