Ubuntu cocos2d-x 找不到cocos-ext.h文件

Cocos2d-x
#1

问题简述：在Ubuntu下面当项目加入cocos-ext.h文件提示

引擎版本2.2.4

例如在Cpp的HelloWorld中加入

#include "cocos-ext.h"

然后就报错找不到这个文件

以下是我MakefIle文件的内容

XECUTABLE = HelloCpp

INCLUDES = -I.. -I../Classes

SOURCES = main.cpp
../Classes/AppDelegate.cpp
../Classes/HelloWorldScene.cpp

COCOS_ROOT = ../../../..
include $(COCOS_ROOT)/cocos2dx/proj.linux/cocos2dx.mk

SHAREDLIBS += -lcocos2d
COCOS_LIBS = $(LIB_DIR)/libcocos2d.so

$(TARGET): $(OBJECTS) $(STATICLIBS) $(COCOS_LIBS) $(CORE_MAKEFILE_LIST)
@mkdir -p $(@D)
$(LOG_LINK)$(CXX) $(CXXFLAGS) $(OBJECTS) -o $@ $(SHAREDLIBS) $(STATICLIBS)

$(OBJ_DIR)/%.o: %.cpp $(CORE_MAKEFILE_LIST)
@mkdir -p $(@D)
$(LOG_CXX)$(CXX) $(CXXFLAGS) $(INCLUDES) $(DEFINES) $(VISIBILITY) -c $< -o $@

$(OBJ_DIR)/%.o: ../%.cpp $(CORE_MAKEFILE_LIST)
@mkdir -p $(@D)
$(LOG_CXX)$(CXX) $(CXXFLAGS) $(INCLUDES) $(DEFINES) $(VISIBILITY) -c $< -o $@

求帮解决。