GNU Makefile for google benchmark
In a clean rule, consider removing $(OBJECT_FILES) instead of src/*.o
I don't see where LDFLAGS is ever used.
I understand that you are not likely to edit include files; however, to be on a safe side you may want to add auto dependency generation:

DEP_FILES = $(SOURCE_FILES:.cc=.d)

%.d: %.cc
    $(CC) $(INCLUDES) $(CXXFLAGS) -MM -MT -o $@ $&lt;

-include $(DEP_FILES)


(and remove $(DEP_FILES) on clean).