anchor.diff:      "-lopenblas"
       "-lpcre"
       "-lsuitesparse"
  -    "-lunistring"
       "-lz"
     ];
   
  
positive.code: { stdenv, fetchgit, gfortran, perl, m4, llvm, gmp, pcre, zlib
  , readline, fftwSinglePrec, fftw, libunwind, suitesparse, glpk, fetchurl
  , ncurses, libunistring, patchelf, openblas, arpack
  , tcl, tk, xproto, libX11, git, mpfr, which
  }:
  
  with stdenv.lib;
  
negative.code:     let
        dsfmt_ver = "2.2";
        grisu_ver = "1.1.1";
  
        dsfmt_src = fetchurl {
          url = "http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/SFMT/dSFMT-src-${dsfmt_ver}.tar.gz";
  