anchor.diff: -{ stdenv, fetchurl, fetchFromGitHub, fixDarwinDylibNames, autoconf, boost, brotli, cmake, double-conversion, flatbuffers, gflags, glog, gtest, lz4, perl, python, rapidjson, snappy, thrift, uriparser, which, zlib, zstd }:
  +{ stdenv, fetchurl, fetchFromGitHub, fixDarwinDylibNames, autoconf, boost
  +, brotli, cmake, double-conversion, flatbuffers, gflags, glog, gtest, lz4, perl
  +, python, rapidjson, snappy, thrift, uriparser, which, zlib, zstd }:
   
   let
     parquet-testing = fetchFromGitHub {
  
positive.code: 
    meta = {
      description = "A  cross-language development platform for in-memory data";
      homepage = https://arrow.apache.org/;
      license = stdenv.lib.licenses.asl20;
      platforms = stdenv.lib.platforms.unix;
      maintainers = with stdenv.lib.maintainers; [ tobim veprbl ];
  
negative.code:     rev = "a277dc4e55ded3e3ea27dab1e4faf98c112442df";
      sha256 = "1yh5a8l4ship36hwmgmp2kl72s5ac9r8ly1qcs650xv2g9q7yhnq";
    };
  
  in stdenv.mkDerivation rec {
    pname = "arrow-cpp";
    version = "0.15.0";
  
    src = fetchurl {
      url =
        "mirror://apache/arrow/arrow-${version}/apache-arrow-${version}.tar.gz";
      sha256 = "0n7xrn5490r2snjl45pm2a4pr2x8a29sh8mpyi4nj5pr9f62s1yi";
    };
  
  