anchor.diff:      '';
   
       cmakeFlags = [
  -      # do not set GCC's -march=xxx based on builder's /proc/cpuinfo
  -      "-DUSE_OPTIMIZE_FOR_ARCHITECTURE=OFF"
         # also avoid using builder's /proc/cpuinfo
         "-DHAVE_SSE42=${if stdenv.hostPlatform.sse4_2Support then "ON" else "OFF"}"
         "-DASM_OPTIMIZATIONS=${if stdenv.hostPlatform.sse4_2Support then "ON" else "OFF"}"
  -    ];
  +    ]
  +    # do not set GCC's -march=xxx based on builder's /proc/cpuinfo
  +    # (removed in cc860c333c7f0c1aed9a2179e3e8b926d92b6df4)
  +    ++ lib.optional (!lib.versionAtLeast version "3.9") "-DUSE_OPTIMIZE_FOR_ARCHITECTURE=OFF";
   
       meta = with lib; {
         homepage = "https://www.arangodb.com";
         description = "A native multi-model database with flexible data models for documents, graphs, and key-values";
         license = licenses.asl20;
         platforms = platforms.linux;
  -      maintainers = [ maintainers.flosse ];
  +      maintainers = [ maintainers.flosse maintainers.jsoo1 ];
       };
     };
   in {
     arangodb_3_3 = common {
  +    stdenv = gcc8Stdenv;
       version = "3.3.24";
       sha256 = "18175789j4y586qvpcsaqxmw7d6vc3s29qm1fja5c7wzimx6ilyp";
     };
     arangodb_3_4 = common {
  +    stdenv = gcc8Stdenv;
       version = "3.4.8";
       sha256 = "0vm94lf1i1vvs04vy68bkkv9q43rsaf1y3kfs6s3jcrs3ay0h0jn";
     };
     arangodb_3_5 = common {
  +    inherit stdenv;
       version = "3.5.1";
       sha256 = "1jw3j7vaq3xgkxiqg0bafn4b2169jq7f3y0l7mrpnrpijn77rkrv";
     };
  +  arangodb_3_9 = common {
  +    inherit stdenv;
  +    version = "3.9.3";
  +    sha256 = "078bs8m045ym0ka0n3n1wvzr8gri09bcs574kdzy8z3rrngvp82m";
  +  };
   }
  
positive.code:       inherit sha256;
      };
  
      nativeBuildInputs = [ cmake python2 perl which ];
      buildInputs = [ openssl zlib snappy lzo ];
  
      # prevent failing with "cmake-3.13.4/nix-support/setup-hook: line 10: ./3rdParty/rocksdb/RocksDBConfig.cmake.in: No such file or directory"
  
negative.code: { stdenv, lib, fetchFromGitHub, openssl, zlib, cmake, python2, python3, perl, snappy, lzo, which, catch2, catch }:
  
  let
    common = { stdenv, version, sha256 }: stdenv.mkDerivation {
      pname = "arangodb";
      inherit version;
  
  