anchor.diff:        sha256 = "sha256-n2EuOKy3RGKmEYofNlm+vDDBuiQRuAJEJT6wq6NEJQs=";
         stripRoot = false;
       };
  -  }.${stdenv.targetPlatform.parsed.cpu.name};
  +  };
   
  -  prebuilt_ndk_crt = {
  +  prebuilt_ndk_crt = choosePlatform {
       aarch64 = fetchzip {
         url = "https://android.googlesource.com/toolchain/prebuilts/ndk/r23/+archive/6c5fa4c0d3999b9ee932f6acbd430eb2f31f3151/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/30.tar.gz";
         sha256 = "sha256-KHw+cCwAwlm+5Nwp1o8WONqdi4BBDhFaVVr+7GxQ5uE=";
  
positive.code: }:
  let
  
    prebuilt_crt = {
      aarch64 = fetchzip {
        url =  "https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/+archive/98dce673ad97a9640c5d90bbb1c718e75c21e071/lib/gcc/aarch64-linux-android/4.9.x.tar.gz";
        sha256 = "sha256-LLD2OJi78sNN5NulOsJZl7Ei4F1EUYItGG6eUsKWULc=";
  
negative.code:       sha256 = "sha256-y7CFLF76pTlj+oYev9taBnL2nlT3+Tx8c6wmicWmKEw=";
        stripRoot = false;
      };
    };
  
    prebuilt_libs = choosePlatform {
      aarch64 = fetchzip {
        url = "https://android.googlesource.com/platform/prebuilts/ndk/+archive/f2c77d8ba8a7f5c2d91771e31164f29be0b8ff98/platform/platforms/android-30/arch-arm64/usr/lib.tar.gz";
        sha256 = "sha256-TZBV7+D1QvKOCEi+VNGT5SStkgj0xRbyWoLH65zSrjw=";
  