anchor.diff:  
     packagesWithRDepends = {
       FactoMineR = [ self.car ];
  +    pander = [ self.codetools ];
     };
   
     packagesWithNativeBuildInputs = {
  
positive.code:     RcppZiggurat = [ pkgs.gsl ];
      rgdal = [ pkgs.proj pkgs.gdal ];
      rgeos = [ pkgs.geos ];
      rgl = [ pkgs.mesa pkgs.x11 ];
      Rglpk = [ pkgs.glpk ];
      rggobi = [ pkgs.ggobi pkgs.gtk2 pkgs.libxml2 ];
      RGtk2 = [ pkgs.gtk2 ];
      Rhpc = [ pkgs.zlib pkgs.bzip2 pkgs.icu pkgs.lzma pkgs.openmpi pkgs.pcre ];
      ridge = [ pkgs.gsl ];
  
negative.code:     nloptr = [ pkgs.nlopt ];
      openssl = [ pkgs.openssl ];
      outbreaker = [ pkgs.gsl ];
      pander = [ pkgs.pandoc pkgs.which ];
      pbdMPI = [ pkgs.openmpi ];
      pbdNCDF4 = [ pkgs.netcdf ];
      pbdPROF = [ pkgs.openmpi ];
  