anchor.diff: -{ stdenv, fetchgit, fetchurl
  +{ stdenv, fetchgit, fetchurl, fetchzip
   # build tools
   , gfortran, m4, makeWrapper, patchelf, perl, which, python2
   , runCommand
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "julia";
    version = "0.5.1";
    name = "${pname}-${version}";
  
    src = fetchurl {
      url = "https://github.com/JuliaLang/${pname}/releases/download/v${version}/${name}.tar.gz";
      sha256 = "1a9m7hzzrwk71gvwwrd1p45s64yid61i41n95gm5pzbry6p9fpl0";
    };
    prePatch = ''
      mkdir deps/srccache
  
negative.code:   preBuild = ''
      sed -e '/^install:/s@[^ ]*/doc/[^ ]*@@' -i Makefile
      sed -e '/[$](DESTDIR)[$](docdir)/d' -i Makefile
      export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}
    '';
  
    postInstall = ''
  