Android.mk file error

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it is my android.mk file:

LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) OPENCV_CAMERA_MODULES:=on OPENCV_INSTALL_MODULES:=on include ../../sdk/native/jni/OpenCV.mk LOCAL_SRC_FILES := DetectionAndRecognition.cpp LOCAL_C_INCLUDES += $(LOCAL_PATH) LOCAL_LDLIBS += -llog -ldl LOCAL_MODULE := detection_and_recognition_lib include $(BUILD_SHARED_LIBRARY)

when i built its result error:

20:57:36 * Clean-only build of configuration Default for project AndroidFaceRecognizer-master * "E:\android-ndk-r8e\ndk-build.cmd" clean jni/Android.mk:6: ../../sdk/native/jni/OpenCV.mk: No such file or directory make: * No rule to make target `../../sdk/native/jni/OpenCV.mk'. Stop. 20:57:36 Build Finished (took 406ms)

Any help !!!