Undefined reference to cocos_android_app_init

I’m using cocos2dx 3 alpha and when compiling project have some errors

Android NDK: WARNING: APP_PLATFORM android-17 is larger than android:minSdkVersion 9 in ./AndroidManifest.xml
Android NDK: WARNING: cocos2d-x-3.0alpha0/cocos2dx/Android.mk:cocos2dx_static: LOCAL_LDLIBS is always ignored for static libraries
Android NDK: WARNING: cocos2d-x-3.0alpha0/cocos2dx/platform/android/Android.mk:cocos2dxandroid_static: LOCAL_LDLIBS is always ignored for static libraries
make: Entering directory `cocos2d-x-3.0alpha0/projects/Project PYS/proj.android’
[armeabi] SharedLibrary : libcocos2dcpp.so
cocos2dx/platform/android/nativeactivity.cpp:121: error:* undefined reference to ’cocos_android_app_init(android_app**)’
**collect2: error: ld returned 1 exit status
make: * [obj/local/armeabi/libcocos2dcpp.so] Error 1