anchor.diff:      [
         gfortran perl m4 gmp pcre llvm readline zlib
         fftw fftwSinglePrec libunwind suitesparse glpk ncurses libunistring patchelf
  -      openblas tcl tk xproto libX11 git mpfr which
  +      arpack openblas tcl tk xproto libX11 git mpfr which
       ];
   
     makeFlags =
  
positive.code: 
    dsfmt_ver = "2.2";
    grisu_ver = "1.1.1";
    arpack_ver = "3.1.5";
    utf8proc_ver = "1.1.6";
  
    dsfmt_src = fetchurl {
  
negative.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
  }:
  
  