[XeTeX] Landscape mode and papersize

[Orm Finnendahl]

Hi,

 how do I manage to output to a page in landscape mode with plain
tetex? Search engines suggested "\special{pagesize=a4:landscape}" but
typesetting issued the warning

"** WARNING ** Unparsed material at end of special ignored."

and generated portrait mode. I tried with XeTeX, Version
3.1415926-2.2-0.9995.2 (TeX Live 2009/Debian) on linux.

Can somebody give me a hint how to pass options (also for other
uncommon pageformats) to the pdf converter?

--
Orm