anchor.diff:      RcppZiggurat = [ pkgs.gsl ];
       rgdal = [ pkgs.proj pkgs.gdal ];
       rgeos = [ pkgs.geos ];
  +    rggobi = [ pkgs.ggobi pkgs.gtk2 pkgs.libxml2 ];
       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 ];
  
positive.code:     nloptr = [ pkgs.nlopt ];
      openssl = [ pkgs.openssl ];
      outbreaker = [ pkgs.gsl ];
      pbdMPI = [ pkgs.openmpi ];
      pbdNCDF4 = [ pkgs.netcdf ];
      pbdPROF = [ pkgs.openmpi ];
  
negative.code:     "PairViz" # requires graph
      "pamm" # requires nlopt
      "PANDA" # requires GO.db
      "panelAR" # requires nlopt
      "papeR" # requires nlopt
      "parboost" # requires nlopt
  