E:android-ndk-r20-windows-x86_64android-ndk-r20/toolchains/aarch64-linux-
 android-4.9/prebuilt/windows-x86_64/lib/gcc/aarch64-linux-
 android/4.9.x/../../../../aarch64-linux-android/binld: cannot find -lc++
 clang++: error: linker command failed with exit code 1 (use -v to see
 invocation)
  make: *** [libanalogclock.so] Error 1