anchor.diff:  
   buildGoPackage rec {
     name = "ipfs-${version}";
  -  version = "0.4.14";
  +  version = "0.4.15";
     rev = "v${version}";
   
     goPackagePath = "github.com/ipfs/go-ipfs";
  
positive.code:   extraSrcPaths = [
      (fetchgx {
        inherit name src;
        sha256 = "0gad5y5clkrk5jsjj9gmrlnx8kbn2vg50vka1b8jg7b55hdvvlcg";
      })
    ];
  
  
negative.code:     owner = "ipfs";
      repo = "go-ipfs";
      inherit rev;
      sha256 = "1ry4a4pq26dbwy2b9cwi3xjaiyq6sng9lxnb1n30zxhp4w7rla2h";
    };
  
    meta = with stdenv.lib; {
  