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由於 iftex [已關閉]，安裝失敗

tag-icon • tag-icon miktex miktex2.9
由於 iftex [已關閉]，安裝失敗

更新軟體包（在 Miktex 上）後，幾乎不再編譯任何東西。例如：

\documentclass{article}
\usepackage{libertine}

\begin{document}
plop
\end{document}

導致以下錯誤：

C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:10: Undefined control sequence. [\ifxetex]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:12: Extra \else. [\else]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:12: Undefined control sequence. [\else\ifluatex]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:14: Extra \else. [\else]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:16: Extra \fi. [\fi]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:16: Extra \fi. [\fi\fi]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:289: Undefined control sequence. [  \defaultfontfeatures]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:290: LaTeX Error: Missing \begin{document}. [     L]
C:\Users\TL\AppData\Roaming\MiKTeX\2.9\tex\latex\libertine\libertine.sty:296: Undefined control sequence. [    \setmainfont]

然而，該包IFTEX已安裝，並且沒有伊克斯泰克斯包下載。似乎伊普特克斯提供\ifXeTeX，而不是ifxetex（說真的！？！...）。類似的問題也出現在\ifluatex.

如何解決這個問題？

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