anchor.diff:    extraSrcPaths = [
       (fetchgx {
         inherit name src;
  -      sha256 = "0gad5y5clkrk5jsjj9gmrlnx8kbn2vg50vka1b8jg7b55hdvvlcg";
  +      sha256 = "0bysfh2hd040i8lnyzhy96frflls4kdnlw748cl51ngqg3rwbhgz";
       })
     ];
   
  
positive.code:     owner = "ipfs";
      repo = "go-ipfs";
      inherit rev;
      sha256 = "0wvjw8jziwhvfwhksg26qlj2irznl5bs2yll9jkv335pnwb5qi3v";
    };
  
    meta = with stdenv.lib; {
  
negative.code: 
  buildGoPackage rec {
    name = "ipfs-${version}";
    version = "0.4.15";
    rev = "v${version}";
  
    goPackagePath = "github.com/ipfs/go-ipfs";
  