anchor.diff:  
     golang_protobuf_extensions = buildFromGitHub {
       version = 6;
  -    rev = "v1.0.0";
  +    rev = "v1.0.1";
       owner  = "matttproud";
       repo   = "golang_protobuf_extensions";
  -    sha256 = "0h81jrphr7cfln91glawvbc8wqf91p1kc2dg7zp30r5axfqfhnqk";
  +    sha256 = "16vxlzihbfab5jl2a7v8jixiifmdc6g96h5wln3407rzxdyg9zl9";
       propagatedBuildInputs = [
         protobuf
       ];
  
positive.code: 
    tools = buildFromGitHub {
      version = 6;
      rev = "a5b4c53f6e8bdcafa95a94671bf2d1203365858b";
      date = "2018-05-25";
      owner = "golang";
      repo = "tools";
      sha256 = "05bfbdpm758c93n38xbrcjxmcax3gj7skzl8myl6xjsjyfn1a8lg";
      goPackagePath = "golang.org/x/tools";
  
      preConfigure = ''
  
negative.code:       tar-utils
      ];
      meta.useUnstable = true;
      date = "2018-06-13";
    };
  
    go-ipfs-cmdkit = buildFromGitHub {
      version = 6;
      rev = "v1.1.1";
      owner  = "ipfs";
      repo   = "go-ipfs-cmdkit";
      sha256 = "1jr9vj5mdp9xmindn7and0vdsapwxksbyvx3dz60xxz39jppy75d";
      propagatedBuildInputs = [
        sys
      ];
    };
  
    go-ipfs-util = buildFromGitHub {
      version = 6;
      rev = "v1.2.8";
      owner  = "ipfs";
      repo   = "go-ipfs-util";
      sha256 = "11zbmnqmp99jwssjrkvpmh3l4vn7pv31ys05qs5nl6snzc4h2ja1";
      propagatedBuildInputs = [
        base58
        go-multihash
  