(require 'ox-latex)

(setq org-latex-packages-alist '(("" "listings")
                                 ("" "booktabs")
                                 ("AUTO" "polyglossia" t ("xelatex" "lualatex"))
                                 ("" "grffile")
                                 ("" "unicode-math")
                                 ("" "xcolor")))

(setq org-latex-pdf-process '("latexmk -xelatex -shell-escape -quiet -f %f"))

(setq org-latex-compiler "xelatex")

(setq org-latex-listings t)
(setq org-latex-tables-booktabs t)
(setq org-latex-images-centered t)

(setq org-latex-listings-options
      '(("basicstyle" "\\ttfamily")
        ("showstringspaces" "false")
        ("keywordstyle" "\\color{blue}\\textbf")
        ("commentstyle" "\\color{gray}")
        ("stringstyle" "\\color{green!70!black}")
        ("stringstyle" "\\color{red}")
        ("frame" "single")
        ("numbers" "left")
        ("numberstyle" "\\ttfamily")
        ("columns" "fullflexible")))

(setq org-latex-inputenc-alist '((\"utf8\" . \"utf8x\")))

(with-eval-after-load 'ox-latex
  (add-to-list 'org-latex-classes
               '("koma-general"
                 "\\documentclass[a4paper,8pt,captions=tableheading]{scrartcl}
  \\linespread{1.25}
  \\usepackage{fontspec}
  \\defaultfontfeatures{Mapping=tex-text, RawFeature={+zero}}
  \\setmainfont{Noto Sans}[BoldFont=*-Medium,ItalicFont=*-Italic]
  \\setsansfont{Noto Sans}[BoldFont=*-Medium,ItalicFont=*-Italic]
  \\setmonofont{Noto Sans Mono}[BoldFont=*-Medium,Scale=0.8]
  \\usepackage{geometry}
  \\geometry{
    a4paper,
    left=1.2cm,
    right=2.1cm,
    top=1.6cm,
    bottom=1.1cm
    }
  \\usepackage{fancyhdr}
  \\pagestyle{fancy}
  \\fancyhf{}
  \\fancyhead[L]{\\leftmark}  % Left header
  \\fancyhead[R]{\\thepage}  % Right header"
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\subsection{%s}" . "\\subsection*{%s}")
                 ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
                 ("\\paragraph{%s}" . "\\paragraph*{%s}")
                 ("\\subparagraph{%s}" . "\\subparagraph*{%s}"))))

(setq org-latex-default-class "koma-general")

(eval-after-load 'ox '(require 'ox-koma-letter))