anchor.diff:        "USE_SYSTEM_GMP=1"
         "USE_SYSTEM_GRISU=1"
         "USE_SYSTEM_LIBUNWIND=1"
  -      "USE_SYSTEM_LLVM=1"
         "USE_SYSTEM_MPFR=1"
         "USE_SYSTEM_PATCHELF=1"
         "USE_SYSTEM_PCRE=1"
  
positive.code: { stdenv, fetchgit, fetchurl
  # build tools
  , gfortran, git, m4, patchelf, perl, which
  # libjulia dependencies
  , libunwind, llvm, readline, utf8proc, zlib
  # standard library dependencies
  
negative.code:         name = "dsfmt-${dsfmt_ver}.tar.gz";
          md5 = "cb61be3be7254eae39684612c524740d";
        };
  
      in [ dsfmt_src llvm.src ];
  
    prePatch = ''
      copy_kill_hash(){
  