anchor.diff:  , perl
   
   , alsa-lib
  -, libjpeg-turbo_1-4
  +, libjpeg-turbo
   , libx11
   , qt5
   
  
positive.code:     libx11
      qt5
    ] ++ [
      libjpeg-turbo_1-4
    ];
  
    postPatch = ''
  
negative.code: # See libv4l in all-packages.nix for the libs only (overrides alsa, libX11 & QT)
  
  stdenv.mkDerivation rec {
    name = "v4l-utils-1.12.6";
  
    src = fetchurl {
      url = "https://linuxtv.org/downloads/v4l-utils/${name}.tar.bz2";
      multihash = "QmVfyxtJPBRu5yPod7sdrs7ALpTx8GsGnmJTb8uFLkHkL2";
      sha256 = "74da1040284eaba48277ad051ffe1fca0ee05c5591bb01179d928def6d0a4561";
    };
  
    nativeBuildInputs = [
  