added : xxhash namespace enforced from xxhash.h.
added : xxhash namespace test.
removed : -DXXH_NAMESPACE
diff --git a/lib/Makefile b/lib/Makefile
index 1b4cb37..579a906 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -46,7 +46,7 @@
 LIBDIR ?= $(PREFIX)/lib
 INCLUDEDIR=$(PREFIX)/include
 
-CPPFLAGS= -I. -I./common -DXXH_NAMESPACE=ZSTD_
+CPPFLAGS= -I. -I./common
 CFLAGS ?= -O3
 CFLAGS += -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow -Wstrict-aliasing=1 \
           -Wswitch-enum -Wdeclaration-after-statement -Wstrict-prototypes -Wundef