Unable to build against functions in the system library

I'm going crazy here.

Basically, I'm trying to access some functions in a shared library located on the / lib / system on the Android platform using the NDK.

The library I'm trying to use is libsonivox.so. My main goal is to use it from NativeActivity. I understand that this can complicate the situation, because I will need to load this library (statically) before loading my own library, which depends on it. Therefore, I am trying to get it to work through normal activities and JNI.

In Activity, I load libraries as follows:

static {
  System.loadLibrary("sonivox");
  System.loadLibrary("native-audio-jni");
}

The "native-audio-jni" library is taken from the NDK samples, but I modify it in a rudimentary attempt to access the sonivox functions.

Without any libsonivox calls from libnative-audio-jni, everything compiles fine. This line from LogCat's output gives me hope:

  04-26 15:01:14.973: D/dalvikvm(691): No JNI_OnLoad found in /system/lib/libsonivox.so   
  0x412a1100, skipping init

So, the library is loaded.

Then I add this function to native-audio-jni.c:

void Java_jay_enn_eye_JNImidiActivity_createMidi(JNIEnv* env,
        jclass clazz)
{
  pLibConfig = EAS_Config();
}

pLibConfig is declared as follows:

static const S_EAS_LIB_CONFIG* pLibConfig = NULL;

When this is declared, without adding the specified function, it compiles fine. Therefore, at least the header files ... are.

When I insert this function into the code, this is the output of ndk-build:

  Compile thumb  : native-audio-jni <= native-audio-jni.c
  SharedLibrary  : libnative-audio-jni.so
  ./obj/local/armeabi/objs/native-audio-jni/native-audio-jni.o: In function
  `Java_jay_enn_eye_JNImidiActivity_createMidi':
  /home/anthony/Documents/eclipse/JNImidi/jni/native-audio-jni.c:202: undefined   
  reference
  to `EAS_Config'
  collect2: ld returned 1 exit status
  make: *** [obj/local/armeabi/libnative-audio-jni.so] Error 1

I'm not sure libnative-audio-jni just cannot access libsonivox, or I need dlsym () or sym () to bind the sonivox functions in order to use them. I could not try any of them, since the library is located in the / lib / system and is not provided by me, so I do not have the full path for this.

, , - libsonivox.so, Android.mk, lib . , , .

EDIT: Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := native-audio-jni
LOCAL_SRC_FILES := native-audio-jni.c
# for native audio
LOCAL_LDLIBS    += -lOpenSLES
# for logging
LOCAL_LDLIBS    += -llog
# for native asset manager
LOCAL_LDLIBS    += -landroid

include $(BUILD_SHARED_LIBRARY)

- . , sonivox . , , , PREBUILT_SHARED_LIBRARY PREBUILT_STATIC_LIBRARY. , OpenSL . , sonivox , -lsonivox, .