[問題] xelatex求助

[mathfeel (mathfeel)]

簡單的測識檔：
\documentclass{article}
\usepackage{fontspec}
begin{document}
This is plain old English.
\end{document}

跑xelatex的結果：
$ xelatex -no-pdf xetex-utf8.tex
This is XeTeX, Version 3.141592-2.2-0.995 (Web2C 7.5.5)
entering extended mode
(./xetex-utf8.tex
LaTeX2e <2003/12/01>
Babel <v3.8d> and hyphenation patterns for american, french, german, ngerman,
b
ahasa, basque, bulgarian, catalan, croatian, czech, danish, dutch, esperanto,
e
stonian, finnish, greek, icelandic, irish, italian, latin, norsk, polish,
portu
ges, romanian, slovak, slovene, spanish, swedish, turkish, ukrainian,
nohyphena
tion, loaded.
(/usr/share/texmf/tex/latex/base/article.cls
Document Class: article 2004/02/16 v1.4f Standard LaTeX document class
(/usr/share/texmf/tex/latex/base/size10.clo))
(/usr/share/texmf/tex/xelatex/fontspec/fontspec.sty
(/usr/share/texmf/tex/generic/ifxetex/ifxetex.sty)
(/usr/share/texmf/tex/latex/tools/calc.sty)
(/usr/share/texmf/tex/latex/xkeyval/xkeyval.sty
(/usr/share/texmf/tex/generic/xkeyval/xkeyval.tex
(/usr/share/texmf/tex/generic/xkeyval/keyval.tex)))

LaTeX Warning: You have requested, on input line 39, version
               `2005/05/07' of package xkeyval,
               but only version
               `2005/01/30 v2.0 package option processing (HA)'
               is available.

! Undefined control sequence.
l.503 \define@choicekey
                       [zf]{preparse}{Renderer}{AAT,ICU}{%
? x
No pages of output.
Transcript written on xetex-utf8.log.

還有跑xelatex -no-pdf出來的.xdv檔用甚麼看(linux)?

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