anchor.diff:    };
   
     ipfs = buildFromGitHub {
  -    rev = "v0.4.2";
  +    date = "2016-07-14";
  +    rev = "6912f47a446e61f6a4168fc859b0d9ade501a2ca";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "098jcmc94i5p0amm8g3fkizpchd8p4kqzdy2yy7m6q8sfjlsdg2m";
  -    gxSha256 = "0dxr1jrgsldv4154h2sj18q0mpmgnrq1dzqfrnynhzfs2q3rq50k";
  +    sha256 = "1166ed6d199056157bc11a5560abe3aa3bb717884ddb59f6adc084e1f727f963";
  +    gxSha256 = "0aq97liijy8xp2g4k8s92jcwazsybwr7idk1x14n2kj33vrlr0rf";
   
       subPackages = [
         "cmd/ipfs"
       ];
  +  };
  +
  +  json-filter = buildFromGitHub {
  +    owner = "whyrusleeping";
  +    repo = "json-filter";
  +    rev = "ff25329a9528f01c5175414f16cc0a6a162a5b8b";
  +    date = "2016-06-15";
  +    sha256 = "0y1d6yi09ac0xlf63qrzxsi7dqf10wha3na633qzqjnpjcga97ck";
     };
   
     jwalterweatherman = buildFromGitHub {
  
positive.code:     propagatedBuildInputs = [
        iter
      ];
    };
  
    mmark = buildFromGitHub {
  
negative.code:       roaring
        tagflag
      ];
      meta.autoUpdate = false;
    };
  
    missinggo_lib = buildFromGitHub {
  