anchor.diff:      owner = "ipfs";
       repo = "go-ipfs";
       inherit rev;
  -    sha256 = "103mlsnqfnnqxh4phr192haaiv98d1bwpvca1sqrxz1216r5x0ik";
  +    sha256 = "0wvjw8jziwhvfwhksg26qlj2irznl5bs2yll9jkv335pnwb5qi3v";
     };
   
     meta = with stdenv.lib; {
  
positive.code:   extraSrcPaths = [
      (fetchgx {
        inherit name src;
        sha256 = "150lhf5999jz0nck5s0fs0fp3pgaj85s7dndh68h9caw1fwpwb4f";
      })
    ];
  
  
negative.code: 
  buildGoPackage rec {
    name = "ipfs-${version}";
    version = "0.4.14";
    rev = "v${version}";
  
    goPackagePath = "github.com/ipfs/go-ipfs";
  