anchor.diff:        "prefix=$(out)"
         "SHELL=${stdenv.shell}"
   
  -      "USE_SYSTEM_PATCHELF=1"
  -
         "USE_SYSTEM_BLAS=1"
         "LIBBLAS=-lopenblas"
         "LIBBLASNAME=libopenblas"
  
positive.code:       "LIBLAPACKNAME=libopenblas"
  
        "USE_SYSTEM_ARPACK=1"
  
        "USE_SYSTEM_UTF8PROC=1"
      ];
  
  
negative.code: { stdenv, fetchgit, fetchurl
  # build tools
  , gfortran, git, m4, patchelf, perl, which
  # libjulia dependencies
  , libunwind, llvm, readline, utf8proc, zlib
  # standard library dependencies
  , double_conversion, fftwSinglePrec, fftw, glpk, gmp, mpfr, pcre
  , openblas, arpack, suitesparse
  }:
  
  with stdenv.lib;
  