anchor.diff:  
     procfs = buildFromGitHub {
       version = 2;
  -    rev = "a59ae619c824360be3641ceb5a456ff13dd58be6";
  -    date = "2017-02-14";
  +    rev = "a1dba9ce8baed984a2495b658c82687f8157b98f";
  +    date = "2017-02-16";
       owner  = "prometheus";
       repo   = "procfs";
  -    sha256 = "0m7bjxxsvp4d880sdc8x7bz4q6r5rfd6vm37qqzjqg16z918bdm4";
  +    sha256 = "08dasdwixak8lfv663r626qv8lbp3zyr391s8rjky2ijcn3xyajx";
     };
   
     properties = buildFromGitHub {
  
positive.code:     version = 2;
      owner = "spf13";
      repo = "cobra";
      rev = "b5d8e8f46a2f829f755b6e33b454e25c61c935e1";
      date = "2017-02-10";
      sha256 = "0bik50w91b4i9s987ybndi0mkm7h6h9lzrk92saf07ckv4gw28x9";
      buildInputs = [
        pflag
        viper
  
negative.code:       testify
      ];
      meta.useUnstable = true;
      date = "2017-02-17";
    };
  
    cupcake_rdb = buildFromGitHub {
  