anchor.diff:  
   buildGoPackage rec {
     name = "ipfs-${version}";
  -  version = "0.4.17";
  +  version = "0.4.18";
     rev = "v${version}";
   
     goPackagePath = "github.com/ipfs/go-ipfs";
  
positive.code:   extraSrcPaths = [
      (fetchgx {
        inherit name src;
        sha256 = "0grdgnr67r3qh0ppc3flrhcw8zlvx10mxypd8q2mhkil9w4dpcna";
      })
    ];
  
  
negative.code:     owner = "ipfs";
      repo = "go-ipfs";
      inherit rev;
      sha256 = "0h4j18qpycfmmlhb9khvhbk8c1zqajflvw8gk3l8j7wxrxh5j2s6";
    };
  
    meta = with stdenv.lib; {
  