anchor.diff:    };
   
     slices = buildFromGitHub {
  -    version = 1;
  -    rev = "bb44bb2e4817fe71ba7082d351fd582e7d40e3ea";
  +    version = 2;
  +    rev = "145c47818f5f4e3ab04935822b3bd440e54ffc45";
       owner  = "feyeleanor";
       repo   = "slices";
  -    sha256 = "05i934pmfwjiany6r9jgp27nc7bvm6nmhflpsspf10d4q0y9x8zc";
  -    date = "2013-02-25";
  +    sha256 = "1bgzczwymd0498gk9ikrdfw32s5cir9n1skrnz0jh5qwkxdljm9n";
  +    date = "2016-12-30";
       propagatedBuildInputs = [
         raw
       ];
  
positive.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-12-21";
      rev = "99d72c27818353eb2b9c05710a9a8eba87518323";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "0bq6ci1gbld1f2h4wdxppw74pzr73z8c9digqz199ilj4qakkdyi";
      gxSha256 = "0qg7yrjjski84wp9apzhd25v3ljkgxg1vl1hm6xnb392pnxx9qiw";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  
negative.code: 
    maxminddb-golang = buildFromGitHub {
      version = 2;
      rev = "v1.1.0";
      owner  = "oschwald";
      repo   = "maxminddb-golang";
      sha256 = "0z1hbncy2ang3p6zc9pvijbx7y3vgwfi714a4cm5mx6j6125dl49";
      propagatedBuildInputs = [
        sys
      ];
  