anchor.diff:    };
   
     flagfile = buildFromGitHub {
  +    version = 1;
       date = "2016-06-27";
       rev = "b6d6c459091af71c7ebb587296936c8dfe79d797";
       owner  = "spacemonkeygo";
  
positive.code:     ];
    };
  
    perks = buildFromGitHub rec {
      date = "2014-07-16";
      owner  = "bmizerany";
      repo   = "perks";
      rev = "d9a9656a3a4b1c2864fdb44db2ef8619772d92aa";
      sha256 = "1p5aay4x3q255vrdqv2jcl45acg61j3bz6xgljvqdhw798cyf6a3";
    };
  
    beorn7_perks = buildFromGitHub rec {
      date = "2016-08-04";
      owner  = "beorn7";
      repo   = "perks";
  
negative.code:   };
  
    glog = buildFromGitHub {
      version = 1;
      rev = "23def4e6c14b4da8ac2ed8007337bc5eb5007998";
      date = "2016-01-25";
      owner  = "golang";
  