anchor.diff:    extraSrcPaths = [
       (fetchgx {
         inherit name src;
  -      sha256 = "1n8xr9xg23wm255zjm7nxd761xapmsv11a0giks2gaibh4nps1jl";
  +      sha256 = "150lhf5999jz0nck5s0fs0fp3pgaj85s7dndh68h9caw1fwpwb4f";
       })
     ];
   
  
positive.code:     owner = "ipfs";
      repo = "go-ipfs";
      inherit rev;
      sha256 = "1qi87sq490xpj4mip1d30x4v77gkacnw4idm0mwla92pg44v6wh9";
    };
  
    meta = with stdenv.lib; {
  
negative.code: 
  buildGoPackage rec {
    name = "ipfs-${version}";
    version = "0.4.13";
    rev = "v${version}";
  
    goPackagePath = "github.com/ipfs/go-ipfs";
  