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recently I have updated auctex-11.89.5. Then, I got Symbol's function definition is void: signum when I have some compile errors and go to the error by hitting C-c `.

I don't know about lisp code and need some help to tackle this problem.

Thanks in advance.

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    Thanks for the report. Try adding this line at the beginning of your init file as a workaround: (require 'cl). I'll need to fix this, though. – giordano Sep 4 '16 at 16:15
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This error was due to a recent change introduced in AUCTeX (to fix another bug reported in StackExchange network). It has been now fixed upstream, as a temporary fix you can add this line to the beginning of your init file:

(require 'cl)

However, please note that in version 11.88 of AUCTeX has been introduced a nicely formatted list of errors and warnings that can be accessed with M-x TeX-error-overview RET, or from the menu CommandError Overview. You can navigate between errors with n and p, so you can forget about C-c `.

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    Thanks for the solution. The TeX-error-overview is awesome. – Seong Sep 5 '16 at 11:58

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