anchor.diff:      propagatedBuildInputs = [ RColorBrewer stringr dichromat munsell plyr labeling ];
     };
   
  -  stringr = buildRPackage rec {
  +  stringr = buildRPackage {
       name = "stringr-0.6.2";
       src = fetchurl {
         url = "mirror://cran/src/contrib/stringr_0.6.2.tar.gz";
  
positive.code:     };
    };
  
    chron = buildRPackage rec {
      name = "chron-2.3-44";
      src = fetchurl {
        url = "mirror://cran/src/contrib/chron_2.3-44.tar.gz";
  
negative.code:     };
      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
  