[XeTeX] Strange error

[Arthur Reutenauer]

> It is strange because I am unable to find a package named etoolbox in ctan.

  Wilfred has already given the link to the package on CTAN, and as he
said it is part of TeX Live; in the collection latexextra, to be
precise.  What's strange is how you managed to install polyglossia
without installing etoolbox, as the former lists the latter as an
explicit dependency.

	Arthur