;; Originally taken from Bruno Tavernier: http://thread.gmane.org/gmane.emacs.orgmode/31150/focus=31432
;; but adapted to use latexmk 4.22 or higher.
-(setq org-latex-pdf-process '("latexmk -pdflatex=xelatex -bibtex -use-make -pdf %f"))
+(setq org-latex-pdf-process '("latexmk -f -pdflatex=xelatex -bibtex -use-make -pdf %f"))
;; Default packages included in /every/ tex file, latex, pdflatex or xelatex
(setq org-latex-default-packages-alist