anchor.diff:      owner = "zchunk";
       repo = pname;
       rev = version;
  -    sha256 = "1j05f26xppwbkxrm11895blm75i1a6p9q23x7wlkqw198mpnpbbv";
  +    sha256 = "0q1jafxh5nqgn2w5ciljkh8h46xma0qia8a5rj9m0pxixcacqj6q";
     };
   
     nativeBuildInputs = [
  
positive.code:   buildInputs = [
      zstd
      curl
    ];
  
    meta = with stdenv.lib; {
      description = "File format designed for highly efficient deltas while maintaining good compression";
  
negative.code: { stdenv
  , fetchFromGitHub
  , fetchpatch
  , pkgconfig
  , meson
  , ninja
  , zstd
  , curl
  , argp-standalone
  }:
  
  stdenv.mkDerivation rec {
    pname = "zchunk";
    version = "1.1.8";
  
    outputs = [ "out" "lib" "dev" ];
  
  