背景信息：我正在使用 TeXlive 2010（在 ArchLinux x86_64 上，虽然是通过 TUG/CTAN 安装的，而不是从 Arch repos 安装的）。我每天都用 tlmgr 更新我的系统。直到今天一切都很好，也许与最近的更新有关，特别是 hyperref 包的 v6.81u（以及文件 hpdftex.def）。现在，即使是这个简单的文档：
\documentclass{article}
\usepackage{hyperref}
\begin{document}
Hello world.
\end{document}
引发以下错误：
(/usr/local/texlive/2010/texmf-dist/tex/latex/hyperref/hpdftex.def
File: hpdftex.def 2010/11/22 v6.81u Hyperref driver for pdfTeX
/usr/local/texlive/2010/texmf-dist/tex/latex/hyperref/hpdftex.def:35: Undefined
control sequence.
\pdf@ifdraftmode ->\ifnum \pdf@draftmode
=\ltx@one \expandafter \ltx@firstof...
l.35 \pdf@ifdraftmode
{%
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
有其他人遇到过这个问题吗？是软件包版本不兼容吗？如果我在代码开头添加 \listfiles，就会得到以下结果。
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
hyperref.sty 2010/11/22 v6.81u Hypertext links for LaTeX
ltxcmds.sty 2010/04/26 v1.7 LaTeX kernel commands for general use (HO)
ifpdf.sty 2010/01/28 v2.1 Provides the ifpdf switch (HO)
pdftexcmds.sty 2010/04/01 v0.9 Utility functions of pdfTeX for LuaTeX (HO)
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/message (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
kvsetkeys.sty 2010/03/01 v1.9 Key value parser (HO)
etexcmds.sty 2010/01/28 v1.3 Prefix for e-TeX command names (HO)
pdfescape.sty 2010/03/01 v1.9 Provides hex, PDF name and string conversions
(HO)
ifvtex.sty 2010/03/01 v1.5 Switches for detecting VTeX and its modes (HO)
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
hycolor.sty 2009/12/12 v1.6 Color options of hyperref/bookmark (HO)
xcolor-patch.sty 2009/12/12 xcolor patch
letltxmacro.sty 2008/06/24 v1.3 Let assignment for LaTeX macros (HO)
kvoptions.sty 2010/02/22 v3.7 Keyval support for LaTeX options (HO)
pd1enc.def 2010/11/22 v6.81u Hyperref: PDFDocEncoding definition (HO)
intcalc.sty 2007/09/27 v1.1 Expandable integer calculations (HO)
hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
url.sty 2006/04/12 ver 3.3 Verb mode for urls, etc.
bitset.sty 2007/09/28 v1.0 Data type bit set (HO)
bigintcalc.sty 2007/11/11 v1.1 Expandable big integer calculations (HO)
atbegshi.sty 2010/03/25 v1.12 At begin shipout hook (HO)
hpdftex.def 2010/11/22 v6.81u Hyperref driver for pdfTeX
atveryend.sty 2010/03/24 v1.5 Hooks at very end of document (HO)
rerunfilecheck.sty 2010/03/16 v1.6 Rerun checks for auxiliary files (HO)
uniquecounter.sty 2009/12/18 v1.1 Provides unlimited unique counter (HO)
nameref.sty 2010/04/30 v2.40 Cross-referencing by name of section
refcount.sty 2008/08/11 v3.1 Data extraction from references (HO)
gettitlestring.sty 2009/12/18 v1.3 Cleanup title references (HO)
scratch.out
scratch.out
***********
如果有人认为有帮助的话我很乐意上传完整的日志。
答案1
抱歉给您敲响警钟，但我刚刚再次升级，问题似乎已在版本 v6.81v 中得到解决。不过，明智的做法是：小心 v6.81u。
再具体一点：
hyperref.sty 2010/11/26 v6.81v Hypertext links for LaTeX
和
hpdftex.def 2010/11/26 v6.81v Hyperref driver for pdfTeX
运行良好，但 2010/11/22 的 v6.81u 却不行（至少对我来说）。