I&#39;m trying to add native code to my app. I have everything in `../main/jni` as it was in my Eclipse project. I have added `ndk.dir=...` to my `local.properties`. I haven&#39;t done anything else yet (I&#39;m not sure what else is actually required, so if I&#39;ve missed something let me know). When I try and build I get this error:

    Execution failed for task &#39;:app:compileDebugNdk&#39;.
    &gt; com.android.ide.common.internal.LoggedErrorException: Failed to run command:
      	/Users/me/android-ndk-r8e/ndk-build NDK_PROJECT_PATH=null 
    APP_BUILD_SCRIPT=/Users/me/Project/app/build/ndk/debug/Android.mk APP_PLATFORM=android-19 
    NDK_OUT=/Users/me/Project/app/build/ndk/debug/obj 
    NDK_LIBS_OUT=/Users/me/Project/app/build/ndk/debug/lib APP_ABI=all

      Error Code:
      	2
      Output:
      	make: *** No rule to make target `/Users/me/Project/webapp/build/ndk/debug//Users/me/Project/app/src/main/jni/jni_part.cpp&#39;,
     needed by `/Users/me/Project/app/build/ndk/debug/obj/local/armeabi-v7a/objs/webapp//Users/me/Project/app/src/main/jni/jni_part.o&#39;.  
    Stop.

What do I need to do?

__Android.mk:__

    LOCAL_PATH := $(call my-dir)
    
    include $(CLEAR_VARS)
    
    # OpenCV
    OPENCV_CAMERA_MODULES:=on
    OPENCV_INSTALL_MODULES:=on
    include .../OpenCV-2.4.5-android-sdk/sdk/native/jni/OpenCV.mk
    
    LOCAL_MODULE    := native_part
    LOCAL_SRC_FILES := jni_part.cpp
    LOCAL_LDLIBS +=  -llog -ldl
    
    include $(BUILD_SHARED_LIBRARY)

__Application.mk:__

    APP_STL := gnustl_static
    APP_CPPFLAGS := -frtti -fexceptions
    APP_ABI := armeabi armeabi-v7a
    APP_PLATFORM := android-8




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