-OPT_FLAGS=-O6 -DPOPCOUNT_TABLE -DHAS_NATIVE_POPCOUNT -fno-PIC -static
+OPT_FLAGS=-O4 -DPOPCOUNT_TABLE -DHAS_NATIVE_POPCOUNT -fno-PIC -static
INC_FLAGS=-I./libcds/includes/ -I.
CFLAGS= $(INC_FLAGS) $(OPT_FLAGS)
CXXFLAGS= -std=c++0x $(INC_FLAGS) $(OPT_FLAGS)