diff --git a/cocos2dx/proj.linux/Makefile b/cocos2dx/proj.linux/Makefile
index ffafd6fa9e..3549cf946e 100644
--- a/cocos2dx/proj.linux/Makefile
+++ b/cocos2dx/proj.linux/Makefile
@@ -9,9 +9,6 @@ INCLUDES += \
 			-I../../external/chipmunk/include/chipmunk \
 			-I../../extensions/network \
 
-DEFINES += -D__CC_PLATFORM_FILEUTILS_CPP__
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
-
 SOURCES = ../actions/CCAction.cpp \
 ../actions/CCActionCamera.cpp \
 ../actions/CCActionEase.cpp \
diff --git a/cocos2dx/proj.linux/cocos2dx.mk b/cocos2dx/proj.linux/cocos2dx.mk
index 3ea77795e3..15839e1ed2 100644
--- a/cocos2dx/proj.linux/cocos2dx.mk
+++ b/cocos2dx/proj.linux/cocos2dx.mk
@@ -8,6 +8,12 @@ ARFLAGS = cr
 
 DEFINES += -DLINUX
 
+ifdef USE_BOX2D
+DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
+else
+DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
+endif
+
 THIS_MAKEFILE := $(CURDIR)/$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
 ifndef COCOS_ROOT
 COCOS_ROOT := $(realpath $(dir $(THIS_MAKEFILE))/../..)
diff --git a/cocos2dx/proj.nacl/Makefile b/cocos2dx/proj.nacl/Makefile
index c7722b765c..cb75af8dc4 100644
--- a/cocos2dx/proj.nacl/Makefile
+++ b/cocos2dx/proj.nacl/Makefile
@@ -137,8 +137,6 @@ CXXFLAGS += -Wno-sequence-point
 
 TARGET = $(LIB_DIR)/libcocos2d.a
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
-
 all: $(TARGET)
 
 $(TARGET): $(OBJECTS) $(CORE_MAKEFILE_LIST)
diff --git a/cocos2dx/proj.nacl/cocos2dx.mk b/cocos2dx/proj.nacl/cocos2dx.mk
index 8683c301e3..a5f1245022 100644
--- a/cocos2dx/proj.nacl/cocos2dx.mk
+++ b/cocos2dx/proj.nacl/cocos2dx.mk
@@ -18,13 +18,15 @@ THIS_MAKEFILE := $(CURDIR)/$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
 # The top level of the cocos2dx-x source tree.  The parent Makefile will
 # often define this, but in case is doesn't we can find it relative to
 # THIS_MAKEFILE
-COCOS_ROOT ?= $(realpath $(dir $(THIS_MAKEFILE))/../..)
-COCOS_SRC = $(COCOS_ROOT)/cocos2dx
+ifndef COCOS_ROOT
+COCOS_ROOT := $(realpath $(dir $(THIS_MAKEFILE))/../..)
+endif
+COCOS_SRC := $(COCOS_ROOT)/cocos2dx
 
 ifeq ($(NACL_ARCH), i686)
-ARCH_DIR=$(NACL_LIBC)_x86_32
+ARCH_DIR := $(NACL_LIBC)_x86_32
 else
-ARCH_DIR=$(NACL_LIBC)_$(NACL_ARCH)
+ARCH_DIR := $(NACL_LIBC)_$(NACL_ARCH)
 endif
 
 NACLPORTS_ROOT ?= $(NACL_SDK_ROOT)/ports
@@ -33,6 +35,12 @@ OUT_DIR ?= obj
 OBJ_DIR ?= $(OUT_DIR)/$(NACL_ARCH)
 LIB_DIR ?= $(COCOS_ROOT)/lib/nacl/$(ARCH_DIR)
 
+ifdef USE_BOX2D
+DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
+else
+DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION
+endif
+
 INCLUDES += -I$(COCOS_SRC) \
 	-I$(COCOS_SRC)/cocoa \
 	-I$(COCOS_SRC)/include \
diff --git a/extensions/cocos-ext.h b/extensions/cocos-ext.h
index 87f8167fbd..f801410160 100644
--- a/extensions/cocos-ext.h
+++ b/extensions/cocos-ext.h
@@ -42,16 +42,9 @@
 #include "network/HttpClient.h"
 
 // Physics integration
-#if CC_ENABLE_CHIPMUNK_INTEGRATION
+#if CC_ENABLE_CHIPMUNK_INTEGRATION || CC_ENABLE_BOX2D_INTEGRATION
 #include "physics_nodes/CCPhysicsDebugNode.h"
 #include "physics_nodes/CCPhysicsSprite.h"
 #endif
 
-#if CC_ENABLE_BOX2D_INTEGRATION
-#include "physics_nodes/CCPhysicsDebugNode.h"
-#include "physics_nodes/CCPhysicsSprite.h"
-#endif
-
-
 #endif /* __COCOS2D_EXT_H__ */
-
diff --git a/extensions/proj.linux/Makefile b/extensions/proj.linux/Makefile
index f0ade992f5..f84c6adb0e 100644
--- a/extensions/proj.linux/Makefile
+++ b/extensions/proj.linux/Makefile
@@ -10,9 +10,6 @@ INCLUDES = -I$(COCOS_ROOT)/external \
 	-I../GUI/CCControlExtension \
 	-I../network
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1
-DEFINES += -D__CC_PLATFORM_IMAGE_CPP__
-
 SOURCES = ../CCBReader/CCBFileLoader.cpp \
 ../CCBReader/CCMenuItemImageLoader.cpp \
 ../CCBReader/CCBReader.cpp \
diff --git a/samples/Cpp/TestCpp/proj.linux/Makefile b/samples/Cpp/TestCpp/proj.linux/Makefile
index 5edb17fd6c..7fb505a79b 100644
--- a/samples/Cpp/TestCpp/proj.linux/Makefile
+++ b/samples/Cpp/TestCpp/proj.linux/Makefile
@@ -110,8 +110,6 @@ STATICLIBS += \
     $(LIB_DIR)/libbox2d.a \
     $(LIB_DIR)/libchipmunk.a
 
-DEFINES += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1
-
 ####### Build rules
 $(TARGET): $(OBJECTS) $(STATICLIBS) $(COCOS_LIBS) $(CORE_MAKEFILE_LIST)
 	@mkdir -p $(@D)
diff --git a/samples/Cpp/TestCpp/proj.nacl/Makefile b/samples/Cpp/TestCpp/proj.nacl/Makefile
index 4bcf36f8f2..33f6519e05 100644
--- a/samples/Cpp/TestCpp/proj.nacl/Makefile
+++ b/samples/Cpp/TestCpp/proj.nacl/Makefile
@@ -1,5 +1,3 @@
-DEFINES += -DCC_ENABLE_BOX2D_INTEGRATION
-
 COCOS_ROOT = ../../../..
 COCOS2DX_PATH = $(COCOS_ROOT)/cocos2dx