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From: Sven Joachim <svenjoac@gmx.de>
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Subject: Re: Emacs and C programming
Date: Fri, 07 Dec 2007 18:50:09 +0100
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On 2007-12-07 18:20 +0100, Co$t@ntino wrote:

> Hi,
> I add this line in my .emacs file:
>
> (define-key c-mode-base-map "\C-m' newline-and-indent)
>
> To make RET (newline, C-m) equivalent to LFD (newline and indent, C-j).
>
> But when start Emacs says: "Symbol's value as variable is void:
> c-mode-base-map".

Surely, because c-mode has not been loaded yet.

> How could I fix it?

Use a hook to set the keybinding, e.g.

(add-hook 'c-mode-common-hook
	  (lambda ()
	    (define-key c-mode-base-map "\C-m" 'newline-and-indent)))

does the trick for me.  See also the Emacs manual,
(Info "(emacs)Hooks").

Cheers,
       Sven