anchor.diff:    preBuild = ''
       sed -e '/^install:/s@[^ ]*/doc/[^ ]*@@' -i Makefile
       sed -e '/[$](DESTDIR)[$](docdir)/d' -i Makefile
  +    export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}
     '';
   
     postInstall = ''
  
positive.code: { stdenv, fetchgit, fetchurl
  # build tools
  , gfortran, m4, makeWrapper, patchelf, perl, which, python2
  , runCommand
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "julia";
    version = "0.5.2";
    name = "${pname}-${version}";
  
    src = fetchzip {
      url = "https://github.com/JuliaLang/${pname}/releases/download/v${version}/${name}.tar.gz";
      sha256 = "1616f53dj7xc0g2iys8qfbzal6dx55nswnws5g5r44dlbf4hcl0h";
    };
    prePatch = ''
      mkdir deps/srccache
  