title: How to call JNIHelp.h via NDK？
body: <p>I am trying to write an JNI file and it includes JNIHelp.h, however I met some error:</p>
  
  <pre><code>jni/JNIMPEG4Writer.cpp:4:21: fatal error: JNIHelp.h: No such file or directory
  compilation terminated.
  </code></pre>
  
  <p>I guess I should add something to the <code>Android.mk</code> file, but I am not sure what should I add. This is my <code>Android.mk</code> file:
  LOCAL_PATH:= $(call my-dir)</p>
  
  <pre><code>include $(CLEAR_VARS)
  
  LOCAL_MODULE                    := JNIMPEG4Writer
  LOCAL_STATIC_LIBRARIES  := MPEG4Writer
  #LOCAL_LDLIBS                    := -llog
  LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib –llog
  LOCAL_SRC_FILES                 := JNIMPEG4Writer.cpp
  
  include $(BUILD_SHARED_LIBRARY)
  </code></pre>
  
  <p>Does anyone have any ideas? Thanks!</p>