anchor.diff:      };
       propagatedBuildInputs = [ DBI gsubfn proto chron RSQLite RSQLiteExtfuns ];
     };
  +
  +  xtable = buildRPackage {
  +    name = "xtable-1.7-3";
  +    src = fetchurl {
  +      url = "mirror://cran/src/contrib/xtable_1.7-3.tar.gz";
  +      sha256 = "1rsfq0acf1pvpci3jq9fbhsv6ws4d46yap8m2xjk1cr463m9gdcc";
  +    };
  +  };
   }; in self
  
positive.code:     };
    };
  
    plyr = buildRPackage rec {
      name = "plyr-1.8";
      src = fetchurl {
        url = "mirror://cran/src/contrib/plyr_1.8.tar.gz";
        sha256 = "0bd6861af241e6c5ce777ef3f1b0eb72b31cc026669a68f6250b8ecfadf71a66";
      };
    };
  
    proto = buildRPackage rec {
      name = "proto-0.3-10";
      src = fetchurl {
        url = "mirror://cran/src/contrib/proto_0.3-10.tar.gz";
  
negative.code:     propagatedBuildInputs = [ digest plyr gtable reshape2 scales proto ];
    };
  
    gtable = buildRPackage {
      name = "gtable-0.1.2";
      src = fetchurl {
        url = "mirror://cran/src/contrib/gtable_0.1.2.tar.gz";
  