One current .latexmkrc steering configuration file

.latexmkrc

$ENV{'TEXINPUTS'}=':.//:./__include/theme/juelich2/:';  # set environment variable to steer pdflatex to use also the __include directory
$recorder = 1;  # try to use the .fls to notice changed files
$pdf_mode = 1;  # generate PDFs, not DVIs
# $bibtex_use = 2;  # run BibTeX/biber when appears necessary
$pdflatex = "pdflatex --shell-escape %O %S";  # add shell-escape
$pdf_previewer = "open -a /Applications/Skim.app %O %S";  # actually only important if in continuous preview mode, -pvc
$clean_ext = 'nav snm vrb';  # also clean those extensions when invoking latexmk -c

## The following is for glossaries
# add_cus_dep('glo', 'gls', 0, 'run_makeglossaries');
# add_cus_dep('acn', 'acr', 0, 'run_makeglossaries');

# sub run_makeglossaries {
#   if ( $silent ) {
#     system "makeglossaries -q '$_[0]'";
#   }
#   else {
#     system "makeglossaries '$_[0]'";
#   };
# }

# push @generated_exts, 'glo', 'gls', 'glg';
# push @generated_exts, 'acn', 'acr', 'alg';
# $clean_ext .= ' %R.ist %R.xdy'