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