anchor.diff:    # Firmware blobs do not need fixing and should not be modified
     dontFixup = true;
   
  +
     # Unpack the debian package
  +  nativeBuildInputs = [ dpkg ];
     unpackCmd = ''
       if ! [[ "$curSrc" =~ \.deb$ ]]; then return 1; fi
  -    ar -xf "$curSrc"
  -    tar -xf data.tar.xz
  +    dpkg -x "$curSrc" .
     '';
   
     installPhase = ''
  
positive.code: { stdenv, fetchurl }:
  
  stdenv.mkDerivation rec {
    name = "raspberrypi-wireless-firmware-${version}";
  
negative.code:     cp broadcom/*.hcd "$out/lib/firmware/brcm"
    '';
  
    outputHashMode = "recursive";
    outputHashAlgo = "sha256";
    outputHash = "1gwzasl5w5nc0awqv3w2081ns63wd1yds0xh0dg95dc6brnqhhf8";
  
    meta = with stdenv.lib; {
      description = "Firmware for builtin Wifi/Bluetooth devices in the Raspberry Pi 3 and Zero W";
      homepage = https://archive.raspberrypi.org/debian/pool/main/f/firmware-nonfree/;
  