anchor.diff:      owner = "ipfs";
       repo = "go-ipfs";
       inherit rev;
  -    sha256 = "18skmchdqd54wfqhibscqvc360l5ig6vmxd73ivf3bcpj3zvgq7q";
  +    sha256 = "0h4j18qpycfmmlhb9khvhbk8c1zqajflvw8gk3l8j7wxrxh5j2s6";
     };
   
     meta = with stdenv.lib; {
  
positive.code: 
  buildGoPackage rec {
    name = "ipfs-${version}";
    version = "0.4.17";
    rev = "v${version}";
  
    goPackagePath = "github.com/ipfs/go-ipfs";
  
negative.code:   extraSrcPaths = [
      (fetchgx {
        inherit name src;
        sha256 = "05d5m6c2i2kl4rvb0hddyqbidn76ljr2zryi8v2r9i8dbi0164gm";
      })
    ];
  
  