anchor.diff:      nloptr = [ pkgs.nlopt ];
       openssl = [ pkgs.openssl ];
       outbreaker = [ pkgs.gsl ];
  +    pander = [ pkgs.pandoc pkgs.which ];
       pbdMPI = [ pkgs.openmpi ];
       pbdNCDF4 = [ pkgs.netcdf ];
       pbdPROF = [ pkgs.openmpi ];
  
positive.code:     "PairViz" # requires graph
      "pamm" # requires nlopt
      "PANDA" # requires GO.db
      "pander" # build is broken
      "panelAR" # requires nlopt
      "papeR" # requires nlopt
      "parboost" # requires nlopt
  
negative.code: 
    packagesWithRDepends = {
      FactoMineR = [ self.car ];
      pander = [ self.codetools ];
    };
  
    packagesWithNativeBuildInputs = {
  