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From: Eli Zaretskii <eliz@elta.co.il>
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Subject: Re: alternative to (require ...)
Date: 24 Feb 2004 19:19:15 +0200
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> From: Sam Halliday <devnull@example.com>
> Newsgroups: gnu.emacs.help
> Date: Tue, 24 Feb 2004 16:32:51 +0000
> 
>   (require 'htmlize)
> 
> but if this package is not installed on the system, emacs bails on loading the
> rest of my ~/.emacs file. this is quite annoying as i like to maintain a single
> ~/.emacs file and use it wherever i am using emacs.
> 
> is there an alternative command i can use, which doesn't result in emacs crying
> if it can't find the package? or at least if there is an "if exists" check i
> could do and incorporate into a wrapper function, say called (requests ...)

Use condition-case.  Here's an example:

(condition-case err
    (require 'saveplace)
  (error
   (message "Cannot save places %s" (cdr err))))