anchor.diff:  
   stdenv.mkDerivation rec {
     name = "graphene-hardened-malloc-${version}";
  -  version = "190405.003.2019.04.01.19";
  +  version = "1";
   
     src = fetchurl {
  -    url = "https://github.com/GrapheneOS/hardened_malloc/archive/PQ2A.${version}.tar.gz";
  -    sha256 = "1qczmajy3q07jd236dmal4iq5xxcsrkyw26gc9r4vs4wj4m42d11";
  +    url = "https://github.com/GrapheneOS/hardened_malloc/archive/${version}.tar.gz";
  +    sha256 = "1z3kb9fr6w9fcdc42bh8k5b4r10sn5hrwwk4m691qjdgk5hlj3aa";
     };
   
     installPhase = ''
  
positive.code:     make
  
      # these tests don't actually appear to generate overflows currently
      rm read_after_free_small string_overflow
  
      for t in `find . -regex ".*/[a-z_]+"` ; do
        echo "Running $t..."
  
negative.code:     substitute preload.sh $out/bin/preload-hardened-malloc --replace "\$dir" $out/lib
      chmod 0555 $out/bin/preload-hardened-malloc
    '';
  
    separateDebugInfo = true;
  
    doInstallCheck = true;
    installCheckPhase = ''
  