anchor.diff:  , perl, perlPackages, pkgconfig, autoreconfHook
   , poppler, libpaper, graphite2, zziplib, harfbuzz, potrace, gmp, mpfr
   , cairo, pixman, xorg, clisp, biber
  -, makeWrapper
  +, makeWrapper, shortenPerlShebang
   }:
   
   # Useful resource covering build options:
  
positive.code:     install -D ./scripts/latexindent/latexindent.pl "$out"/bin/latexindent
      mkdir -p "$out"/${perl.libPrefix}
      cp -r ./scripts/latexindent/LatexIndent "$out"/${perl.libPrefix}/
    '';
  };
  
  
negative.code: 
    outputs = [ "out" ];
  
    nativeBuildInputs = stdenv.lib.optional stdenv.isDarwin shortenPerlShebang;
    propagatedBuildInputs = with perlPackages; [ FileHomeDir LogDispatch LogLog4perl UnicodeLineBreak YAMLTiny ];
  
    postPatch = ''
  