how to include libprotobuf.a in cocos2d-x

Question

I need to use google's protobuf in my cocos2d-x android project. I include headers and C++ files in project. But when I try to compile project via NDK, compiler return me errors:

jni/../../Classes/PromowallLibrary/protocol.pb.cpp:55: error: undefined reference to 'google::protobuf::DescriptorPool::generated_pool()' jni/../../Classes/PromowallLibrary/protocol.pb.cpp:55: error: undefined reference to 'google::protobuf::DescriptorPool::FindFileByName(std::basic_string, std::allocator > const&) const' jni/../../Classes/PromowallLibrary/protocol.pb.cpp:56: error: undefined reference to 'google::protobuf::internal::LogMessage::LogMessage(google::protobuf::LogLevel, char const*, int)'

and so on. How can I point to -lprotobuf library? I tried:
LOCAL_LDLIBS := -lprotobuf \
but that is doesn't work

UPDATE:
now I try to do in such way - I create static module:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libprotobuf
LOCAL_SRC_FILES := libprotobuf.a
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes

include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := game_shared
LOCAL_MODULE_FILENAME := libgame
LOCAL_CPP_EXTENSION := .cpp \
            .cc

LOCAL_SRC_FILES := helloworld/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp \
                   ../../Classes/PromowallLibrary/protocol.pb.cc

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes \
         $(LOCAL_PATH)

LOCAL_STATIC_LIBRARIES := libprotobuf
LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dx_static cocosdenshion_static

include $(BUILD_SHARED_LIBRARY)

$(call import-module,CocosDenshion/android) $(call import-module,cocos2dx)

Now I get such kind of errors:
/home/ivan/android/android_ndk/toolchains/arm-linux-androideabi-4.6.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6.3/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libprotobuf.a(common.o): incompatible target /home/ivan/android/android_ndk/toolchains/arm-linux-androideabi-4.6.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6.3/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libprotobuf.a(generated_message_util.o): incompatible target /home/ivan/android/android_ndk/toolchains/arm-linux-androideabi-4.6.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6.3/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libprotobuf.a(message_lite.o): incompatible target /home/ivan/android/android_ndk/toolchains/arm-linux-androideabi-4.6.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6.3/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libprotobuf.a(repeated_field.o): incompatible target /home/ivan/android/android_ndk/toolchains/arm-linux-androideabi-4.6.3/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6.3/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi/libprotobuf.a(wire_format_lite.o): incompatible target