anchor.diff:  { stdenv
   , fetchurl
  +, lib
   
   , libatomic_ops
   }:
   
   let
  -  version = "7.6.2";
  +  version = "7.6.4";
   in
   stdenv.mkDerivation rec {
     name = "boehm-gc-${version}";
  
positive.code:     "--enable-large-config"
    ];
  
    meta = with stdenv.lib; {
      description = "The Boehm-Demers-Weiser conservative garbage collector for C and C++";
      homepage = http://hboehm.info/gc/;
      license = licenses.free;
  
negative.code:   src = fetchurl {
      url = "https://github.com/ivmai/bdwgc/releases/download/v${version}/gc-${version}.tar.gz";
      # We need the multihash because they delete old releases
      multihash = "QmZ2oL3LwQB7FixEAzqZkSRRsdVV4cMFxGfhRY4jhms9Y1";
      sha256 = "b94c1f2535f98354811ee644dccab6e84a0cf73e477ca03fb5a3758fb1fecd1c";
    };
  
    buildInputs = [
  