[XeTeX] Setting greek letters in cmtt with XeTeX on OS X

[Arthur Reutenauer]

> Instead of the real (old) Computer Modern fonts it's also possible to  
> use Latin Modern, its successor.

  Which, as the name indicates, is focused on the Latin alphabet.
Hence, not a great choice for Greek letters.

>                                  Another option is to use the TeX Gyre  
> fonts (Curso is Courier), which at least support a lot of Greek.

  The TeX Gyre fonts do contain Greek characters (but not Cyrillic,
alas).  The name of the Courier equivalent is Cursor, by the way.

	Arthur