odroidu2 android build pthread_mutex_thrylock error

out/host/linux-x86/obj/STATIC_LIBRARIES/libLLVMSupport_intermediates/libLLVMSupport.a(Mutex.o): In function `llvm::sys::MutexImpl::tryacquire()':
/home/ljh/odroid/android/external/llvm/lib/Support/Mutex.cpp:143: undefined reference to `pthread_mutex_trylock'
collect2: ld returned 1 exit status
make: *** [out/host/linux-x86/obj/EXECUTABLES/test-librsloader_intermediates/test-librsloader] Error 1
make: *** Waiting for unfinished jobs....
true

 

vi external/llvm/llvm-host-build.mk 에 +LOCAL_LILIBS := -lpthread -ldl