I clearly need --shell-escape in order to use the external library. The question was resolved by Akira-san. Please refer to the stackexchange link once more.

-- John Rinehart

On Fri, May 19, 2017 at 3:44 AM, Reinhard Kotucha <reinhard.kotucha@web.de> wrote:
On 2017-05-12 at 12:39:51 -0400, John Rinehart wrote:

 > Please note, also, the failure of lualatex to use the .latexmkrc
 > file.

Mine looks like this:

--------------------------------------------------------
# -*- Perl -*-

$pdflatex = 'lualatex --shell-escape --synctex=1 %O %S';
$pdf_mode = 1;
$dvi_mode = $postscript_mode = 0;
--------------------------------------------------------

Omit --shell-escape if you don't need it.

Regards,
  Reinhard

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