3 files changed, 8 insertions, 5 deletions
diff --git a/Makefile b/Makefile
index 55af2cd..baa6515 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,9 @@ ifeq ($(CPU),x86-64)
 endif
 SAMPLE_SRC=bench.cpp ecdh.cpp random.cpp rawbench.cpp vote.cpp pairing.cpp large.cpp
 
+ifneq ($(MCL_MAX_OP_BIT_SIZE),)
+  CFLAGS+=-DMCL_MAX_OP_BIT_SIZE=$(MCL_MAX_OP_BIT_SIZE)
+endif
 ##################################################################
 MCL_LIB=$(LIB_DIR)/libmcl.a
 all: $(MCL_LIB)
@@ -27,9 +30,9 @@ endif
 ASM_OBJ=$(OBJ_DIR)/$(CPU).o
 LIB_OBJ=$(OBJ_DIR)/fp.o
 FUNC_LIST=src/func.list
-USE_LLVM?=0
-ifeq ($(USE_LLVM),1)
-  CFLAGS+=-DMCL_USE_LLVM
+MCL_USE_LLVM?=0
+ifeq ($(MCL_USE_LLVM),1)
+  CFLAGS+=-DMCL_USE_LLVM=1
   LIB_OBJ+=$(ASM_OBJ)
 endif
 LLVM_SRC=src/base$(BIT).ll
diff --git a/readme.md b/readme.md
index 1be6193..29e830e 100644
--- a/readme.md
+++ b/readme.md
@@ -47,7 +47,7 @@ msbuild /p:Configuration=Release
 ### Build with LLVM
 require clang 3.8 or over.
 ```
-make USE_LLVM=1 LLVM_VER=-3.8
+make MCL_USE_LLVM=1 LLVM_VER=-3.8
 ```
 
 # License
diff --git a/sample/large.cpp b/sample/large.cpp
index eb8d4e5..d7a627c 100644
--- a/sample/large.cpp
+++ b/sample/large.cpp
@@ -1,6 +1,6 @@
 /*
 	large prime sample for 64-bit arch
-	make USE_LLVM=1 CFLAGS_USER="-DMCL_MAX_OP_BIT_SIZE=768"
+	make MCL_USE_LLVM=1 MCL_MAX_OP_BIT_SIZE=768
 */
 #include <mcl/fp.hpp>
 #include <cybozu/benchmark.hpp>