--- a/C/7zip/Compress/LZMA_Lib/makefile
+++ b/C/7zip/Compress/LZMA_Lib/makefile
@@ -2,7 +2,7 @@ PROG = liblzma.a
CXX = g++ -O3 -Wall
AR = ar
RM = rm -f
-CFLAGS = -c -I ../../../
+CFLAGS += -c -I ../../../
OBJS = \
ZLib.o \