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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: emacs24 Symbol's function definition is void:
	libxml-parse-html-region
Date: Mon, 05 Aug 2013 17:49:33 +0300
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> Date: Mon, 5 Aug 2013 17:36:35 +0900
> From: ishi soichi <soichi777@gmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> OS is MacOSX 10.8.4

Then you indeed need to have an Emacs built with libxml2 support to
begin with.

On Windows, Emacs supports dynamic loading of optional libraries, so
you could install libxml2 after starting Emacs.