anchor.diff:  }:
   
   let
  -  version = "19.0.0";
  +  version = "19.0.2";
     truffleMake = ./truffle.make;
     R = fetchurl {
       url = "http://cran.rstudio.com/src/base/R-3/R-3.5.1.tar.gz";
  
positive.code: in rec {
  
    mx = stdenv.mkDerivation rec {
      version = "5.216.4";
      pname = "mx";
      src = fetchFromGitHub {
        owner  = "graalvm";
        repo   = "mx";
        rev    = version;
        sha256 = "0m4yy3i64r7sc46y04cfbb5834lc9j3wzmmbbjgx3d53s9wqrvyr";
      };
      nativeBuildInputs = [ makeWrapper ];
      prePatch = ''
  
negative.code:       owner  = "oracle";
        repo   = "graal";
        rev    = "vm-${version}";
        sha256 = "168qqngxjri4qw3v6khlnfkl05rlynpflcjq1h3gq6rhasvgr92f";
      };
      patches = [ ./002_setjmp.c.patch ./003_mx_truffle.py.patch ];
      buildInputs = [ mx zlib mercurial jvmci8 git clang llvm
  