I get 'make: *** No rule to make target 'builds/imgui.o', needed by 'imgui'. Stop.' when I try to build.

[Razboinicul]

Here is my Makefile:
SRCS = $(wildcard src/.cpp)
OBJS = $(addprefix builds/, $(addsuffix .o, $(basename $(notdir $(SRCS)))))
EXE = builds/game # Final executable name
IMGUI_SRCS = $(wildcard src/includes/imgui/.cpp) $(wildcard src/includes/imgui/backends/*.cpp)
IMGUI_OBJS = $(addprefix builds/, $(addsuffix .o, $(basename $(notdir $(IMGUI_SRCS)))))
IMGUI_DIR = includes/imgui/
IMGUI_FLAGS = -I$(IMGUI_DIR) -I$(IMGUI_DIR)backends sdl2-config --cflags
IMGUI_LIBS = -lGL -ldl sdl2-config --libs
CC = g++
COMPILER_FLAGS = -Wall -Wextra -std=c++20
LINKER_FLAGS = -lSDL2_ttf -lSDL2_image -llua5.4

all: build

build: $(OBJS) imgui
$(CC) $(OBJS) $(IMGUI_OBJS) $(COMPILER_FLAGS) $(IMGUI_LIBS) $(LINKER_FLAGS) -o $(EXE)
gcc $IMGUI_DIR/imgui.cpp builds/imgui.o

builds/%.o: src/%.cpp
$(CC) $(COMPILER_FLAGS) -c -o $@ $<

builds/%.o: $(IMGUI_DIR)/%.cpp
$(CC) $(IMGUI_FLAGS) -c -o $@ $<

builds/%.o: $(IMGUI_DIR)backends/%.cpp
$(CC) $(IMGUI_FLAGS) -c -o $@ $<

imgui: $(IMGUI_OBJS)
@echo IMGUI: COMPLETE
@echo

.PHONY : clean
clean:
rm $(OBJ_NAME)

.PHONY : run
run:
./$(OBJ_NAME)