anchor.diff:        pkgs.libpcap
       ];
       meta.useUnstable = true;
  -    date = "2017-03-22";
  +    date = "2017-03-27";
     };
   
     etcd_client = buildFromGitHub {
  
positive.code: 
    gocql = buildFromGitHub {
      version = 2;
      rev = "2faf01b9681e19c25b01de3b7e78f90447d71869";
      owner  = "gocql";
      repo   = "gocql";
      sha256 = "1r55h3di8ghmvzpp9kfgg4fl41l0g2b8qd2wc2xsyagvnrijwx35";
      propagatedBuildInputs = [
        inf_v0
        snappy
        hailocab_go-hostpool
        net
      ];
      date = "2017-03-17";
    };
  
    gojsonpointer = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "libp2p";
      repo = "go-libp2p-interface-conn";
      date = "2017-03-24";
      rev = "95afdbf0c900237f3b9104f1f7cfd3d56175a241";
      sha256 = "0yxq323kzh2skn1z416g4zb7hmlk5vm9p9l91b8qd99sv7d9jcb9";
      propagatedBuildInputs = [
        go-ipfs-util
        go-libp2p-crypto
  