This is my current makefile. CXX = g++ CXXFLAGS = -Wall -O3 LDFLAGS = TARGET = testcpp SRCS = main.cpp object.cpp foo.cpp OBJS = $(SRCS:.cpp=.o) DEPS = $(SRCS:.cpp=.d) .PHONY: clean all all: $(TARGET) $(TARGET): $(OBJS) $(CXX) $(CXXFLAGS) $(LDFLAGS) $(OBJS) -o $(TARGET) .cpp.o: $(CXX) $(CXXFLAGS) -c $< -o $@ %.d: %.cpp $(CXX) -M $(CXXFLAGS) $< > $@ clean: rm -f $(OBJS) $(DEPS) $(TARGET) -include $