org-latex-inputenc-alist

org-latex-inputenc-alist is a variable defined in `ox-latex.el'.
Its value is

nil

Documentation:
Alist of inputenc coding system names, and what should really be used.
For example, adding an entry

("utf8" . "utf8x")

will cause \usepackage[utf8x]{inputenc} to be used for buffers that
are written as utf8 files.

You can customize this variable.