anchor.diff:      owner = "ipfs";
       repo = "go-ipfs";
       inherit rev;
  -    sha256 = "0h4j18qpycfmmlhb9khvhbk8c1zqajflvw8gk3l8j7wxrxh5j2s6";
  +    sha256 = "061mgkawimhw3gq506h8m6kw50a2v26qysa5kc5jdqgaqx5yvqh4";
     };
   
     meta = with stdenv.lib; {
  
positive.code: 
  buildGoPackage rec {
    name = "ipfs-${version}";
    version = "0.4.18";
    rev = "v${version}";
  
    goPackagePath = "github.com/ipfs/go-ipfs";
  
negative.code:   extraSrcPaths = [
      (fetchgx {
        inherit name src;
        sha256 = "0bj2kzxjssp7szp1wr9pp08bsi55jgf0k7gi4h70phlib2q673j2";
      })
    ];
  
  