anchor.diff:      version = 2;
       owner = "spf13";
       repo = "viper";
  -    rev = "84f94806c67f59dd7ae87bc5351f7a9c94a4558d";
  -    date = "2017-03-15";
  -    sha256 = "0zw9vwf7hk4xy0lymd7yqkgycbm3p3mdmd8bvxmdjfjkvkhfmb6m";
  +    rev = "5d46e70da8c0b6f812e0b170b7a985753b5c63cb";
  +    date = "2017-04-10";
  +    sha256 = "0jjmbkq6nmp9w9wxhrfrf0c7zg7x8zbq61f1fhp8fpmn8clwrjak";
       buildInputs = [
         crypt
         pflag
  
positive.code:     version = 2;
      owner = "spf13";
      repo = "hugo";
      rev = "v0.19";
      sha256 = "1wnysdixh2va86wkf97wkzz647v3pi352dzffzwxjfgwybq0dfdh";
      buildInputs = [
        ace
        afero
  
negative.code:       swift
      ];
      meta.useUnstable = true;
      date = "2017-04-10";
    };
  
    distribution_for_engine-api = buildFromGitHub {
  