issue with including cimgui backends

I'm making a program that uses OpenGL and SDL2 in C and wanted to use Cimgui as my gui library however, when trying to include the correct backends I'm getting these linker errors:

main.c:104:5: warning: implicit declaration of function 'ImGui_ImplSDL2_InitForOpenGL' [-Wimplicit-function-declaration] 104 | ImGui_ImplSDL2_InitForOpenGL(window, context); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:105:5: warning: implicit declaration of function 'ImGui_ImplOpenGL3_Init' [-Wimplicit-function-declaration] 105 | ImGui_ImplOpenGL3_Init(glsl_version); | ^~~~~~~~~~~~~~~~~~~~~~ C:/TDM-GCC-64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: ./main.o:main.c:(.text+0x386): undefined reference to `ImGui_ImplSDL2_InitForOpenGL' C:/TDM-GCC-64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: ./main.o:main.c:(.text+0x395): undefined reference to `ImGui_ImplOpenGL3_Init' collect2.exe: error: ld returned 1 exit status make: *** [renderer.exe] Error 1 

Here is my makefile (I'm a beginner here so if theres anything stupid going on apologies):

# Compiler definitions CC = gcc CXX = g++ # Compiler flags CFLAGS = -I"C:/Cimgui" -I"C:/Cimgui/imgui" -I"C:/Cimgui" -I"C:/Cimgui/imgui/backends" -I"C:/SDL2/include" -I"C:/cglm-master/include" -I"C:/glew-2.1.0/include" \ -Wall -DGLEW_STATIC -DSDL_STATIC \ -DIMGUI_IMPL_OPENGL_LOADER_GLEW -DIMGUI_DISABLE_OBSOLETE_FUNCTIONS=1 CXXFLAGS = $(CFLAGS) # Same flags for C++ files # Linker flags LDFLAGS = -L"C:/Cimgui/build" -L"C:/cglm-master/build" -L"C:/glew-2.1.0/lib/Release/x64" -L"C:/SDL2/lib" \ -Wl,-Bstatic -lSDL2main -lSDL2 -lcglm -lglew32 \ -Wl,-Bdynamic -lopengl32 -ldxguid \ -lmingw32 -mwindows -lm -ldinput8 -ldxguid -ldxerr8 \ -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 \ -lshell32 -lversion -luuid -static-libgcc \ -lsetupapi -lcfgmgr32 \ -lcimgui # Target executable TARGET = renderer.exe # Define source files SOURCES = ./main.c IMGUI_SOURCES = \ C:/Cimgui/cimgui.cpp \ C:/Cimgui/cimgui_impl.cpp \ C:/Cimgui/imgui/imgui.cpp \ C:/Cimgui/imgui/imgui_draw.cpp \ C:/Cimgui/imgui/imgui_widgets.cpp \ C:/Cimgui/imgui/imgui_tables.cpp \ C:/Cimgui/imgui/imgui_demo.cpp \ C:/Cimgui/imgui/backends/imgui_impl_sdl2.cpp \ C:/Cimgui/imgui/backends/imgui_impl_opengl3.cpp # Convert sources to object files OBJECTS = $(SOURCES:.c=.o) $(IMGUI_SOURCES:.cpp=.o) # Default target all: $(TARGET) # Link all object files into the executable $(TARGET): $(OBJECTS) echo "Objects to link: $(OBJECTS)" $(CXX) $(OBJECTS) -o $(TARGET) $(LDFLAGS) %.o: %.c $(CC) $(CFLAGS) -c $< -o $@ %.o: %.cpp $(CXX) $(CXXFLAGS) -c $< -o $@ # Run the program run: ./$(TARGET) # Clean up clean: rm -f $(OBJECTS) $(TARGET) .PHONY: all clean run 

I tried to follow the example CMakeLists.txt thats included with the sdl_opengl cimgui example project as much as possible but for some reason it cannot find these methods. For reference here is my main.c file:

#include <stdio.h> #define SDL_MAIN_HANDLED #include <SDL.h> #include <GL/glew.h> #include <stdbool.h> #include <cglm/cglm.h> #define CIMGUI_DEFINE_ENUMS_AND_STRUCTS #include <cimgui.h> #include <cimgui_impl.h> #include <windows.h> static int window_width = 640; static int window_height = 480; /////////////////////////////////////////////////////////////////////////////// // Global variables for execution status and game loop /////////////////////////////////////////////////////////////////////////////// static SDL_Window* window = NULL; SDL_GLContext context = NULL; static SDL_Renderer* renderer = NULL; float delta_time = 0; bool is_running = false; float previous_frame_time; //set docking ImGuiIO* ioptr; const char* glsl_version = "#version 130"; /////////////////////////////////////////////////////////////////////////////// // Setup function to initialize variables and game objects /////////////////////////////////////////////////////////////////////////////// int setup(void) { if(SDL_Init(SDL_INIT_EVERYTHING) != 0){ fprintf(stderr, "Error initializing SDL window"); return false; } SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2); SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8); SDL_DisplayMode displayMode; SDL_GetCurrentDisplayMode(0, &displayMode); // int full_screen_width = displayMode.w; // int full_screen_height = displayMode.h; vec3 v = {1.0f, 2.0f, 3.0f}; printf("current vec3: (%f, %f, %f)", v[0],v[1],v[2]); // //TODO create SDL window window = SDL_CreateWindow( "The window into Jamie's madness", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, window_width, window_height, SDL_WINDOW_OPENGL ); if(!window){ fprintf(stderr, "Error creating SDL window"); return false; } //TODO create SDL Renderer renderer = SDL_CreateRenderer(window,-1, 0); if(!renderer){ fprintf(stderr, "Error creating SDL renderer"); return false; } SDL_SetWindowBordered(window,SDL_WINDOWPOS_CENTERED); SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 ); SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 ); SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); context = SDL_GL_CreateContext(window); SDL_GL_MakeCurrent(window,context); glewExperimental = GL_TRUE; glewInit(); glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); // setup imgui igCreateContext(NULL); ioptr = igGetIO(); ioptr->ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls //ioptr->ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls #ifdef IMGUI_HAS_DOCK ioptr->ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable Docking ioptr->ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable Multi-Viewport / Platform Windows #endif ImGui_ImplSDL2_InitForOpenGL(window, context); ImGui_ImplOpenGL3_Init(glsl_version); igStyleColorsDark(NULL); return true; } int main(int argc, char* args[]){ setup(); return 0; }