anchor.diff:      sdImage.storePaths = [ config.system.build.toplevel ];
   
       system.build.sdImage = pkgs.callPackage ({ stdenv, dosfstools, e2fsprogs,
  -    mtools, libfaketime, utillinux, bzip2, zstd }: stdenv.mkDerivation {
  +    mtools, libfaketime, utillinux, zstd }: stdenv.mkDerivation {
         name = config.sdImage.imageName;
   
  -      nativeBuildInputs = [ dosfstools e2fsprogs mtools libfaketime utillinux bzip2 zstd ];
  +      nativeBuildInputs = [ dosfstools e2fsprogs mtools libfaketime utillinux zstd ];
   
         inherit (config.sdImage) compressImage;
   
  
positive.code: 
          echo "${pkgs.stdenv.buildPlatform.system}" > $out/nix-support/system
          if test -n "$compressImage"; then
            echo "file sd-image $img.bz2" >> $out/nix-support/hydra-build-products
          else
            echo "file sd-image $img" >> $out/nix-support/hydra-build-products
          fi
  
negative.code:         fsck.vfat -vn firmware_part.img
          dd conv=notrunc if=firmware_part.img of=$img seek=$START count=$SECTORS
          if test -n "$compressImage"; then
              zstd -T$NIX_BUILD_CORES $img
          fi
        '';
      }) {};
  