anchor.diff:      proj4 = [ pkgs.proj ];
       qtbase = [ pkgs.qt4 ];
       qtpaint = [ pkgs.qt4 ];
  -    R2GUESS = [ pkgs.gsl ];
  +    R2GUESS = [ pkgs.gsl_1 ];
       R2SWF = [ pkgs.zlib pkgs.libpng pkgs.freetype ];
       RAppArmor = [ pkgs.libapparmor ];
       rapportools = [ pkgs.which ];
  
positive.code:     RGtk2 = [ pkgs.gtk2 ];
      Rhpc = [ pkgs.zlib pkgs.bzip2 pkgs.icu pkgs.lzma pkgs.openmpi pkgs.pcre ];
      Rhtslib = [ pkgs.zlib ];
      ridge = [ pkgs.gsl ];
      RJaCGH = [ pkgs.zlib ];
      rjags = [ pkgs.jags ];
      rJava = [ pkgs.zlib pkgs.bzip2 pkgs.icu pkgs.lzma pkgs.pcre pkgs.jdk pkgs.libzip ];
      Rlibeemd = [ pkgs.gsl ];
      rmatio = [ pkgs.zlib ];
      Rmpfr = [ pkgs.gmp pkgs.mpfr ];
      Rmpi = [ pkgs.openmpi ];
  
negative.code:     rbamtools = [ pkgs.zlib ];
      rcdd = [ pkgs.gmp ];
      RcppCNPy = [ pkgs.zlib ];
      RcppGSL = [ pkgs.gsl_1 ];
      RcppOctave = [ pkgs.zlib pkgs.bzip2 pkgs.icu pkgs.lzma pkgs.pcre pkgs.octave ];
      RcppZiggurat = [ pkgs.gsl_1 ];
      rgdal = [ pkgs.proj pkgs.gdal ];
      rgeos = [ pkgs.geos ];
      rggobi = [ pkgs.ggobi pkgs.gtk2 pkgs.libxml2 ];
  