anchor.diff:      "dcGOR" # requires dnet
       "demi" # requires affy, affxparser, and oligo
       "DepthProc" # requires samr
  +    "DiagrammeR" # requires V8 to build
       "Digiroo2" # requires spatstat
       "dixon" # requires spatstat
       "dnet" # requires supraHex, graph, Rgraphviz, and Biobase
  
positive.code:       ];
      });
  
      npRmpi = old.npRmpi.overrideDerivation (attrs: {
        configureFlags = [
          "--with-Rmpi-type=OPENMPI"
        ];
      });
  
      Rmpfr = old.Rmpfr.overrideDerivation (attrs: {
        configureFlags = [
          "--with-mpfr-include=${pkgs.mpfr}/include"
  
negative.code:   packagesToSkipCheck = [
      "Rmpi" # tries to run MPI processes
      "gmatrix" # requires CUDA runtime
      "sprint" # tries to run MPI processes
      "pbdMPI" # tries to run MPI processes
    ];
  