最后一步，编译xposed

Last 10 lines from the log:
frameworks/base/cmds/xposed/libxposed_art.cpp:58: error: undefined reference to 'art::ArtMethod::xposed_callback_method'
frameworks/base/cmds/xposed/libxposed_art.cpp:95: error: undefined reference to 'art::ArtMethod::EnableXposedHook(art::ScopedObjectAccess&, _jobject*)'
frameworks/base/cmds/xposed/libxposed_art.cpp:152: error: undefined reference to 'art::mirror::Object::Clone(art::Thread*, art::mirror::Class*)'
collect2: error: ld returned 1 exit status
build/core/shared_library_internal.mk:80: recipe for target 'out/target/product/generic/obj/SHARED_LIBRARIES/libxposed_art_intermediates/LINKED/libxposed_art.so' failed
make: *** [out/target/product/generic/obj/SHARED_LIBRARIES/libxposed_art_intermediates/LINKED/libxposed_art.so] Error 1
make: *** 正在等待未完成的任务

到了最后这一步 ，请问是发生了啥子问题？