anchor.diff:        ];
       });
   
  -    npRmpi = old.npRmpi.overrideDerivation (attrs: {
  -      configureFlags = [
  -        "--with-Rmpi-type=OPENMPI"
  -      ];
  -    });
  -
       Rmpfr = old.Rmpfr.overrideDerivation (attrs: {
         configureFlags = [
           "--with-mpfr-include=${pkgs.mpfr}/include"
  
positive.code:   packagesToSkipCheck = [
      "Rmpi" # tries to run MPI processes
      "gmatrix" # requires CUDA runtime
      "npRmpi" # tries to run MPI processes
      "sprint" # tries to run MPI processes
      "pbdMPI" # tries to run MPI processes
    ];
  
negative.code:     ncdf4 = [ pkgs.netcdf ];
      ncdf = [ pkgs.netcdf ];
      nloptr = [ pkgs.nlopt ];
      openssl = [ pkgs.openssl ];
      outbreaker = [ pkgs.gsl ];
      pbdMPI = [ pkgs.openmpi ];
  