[TYPO3] GIFBUILDER: Error at require_once class.tslib_gifbuilder.php from BE

[Manuel Rego Casasnovas]

Hello,

I'm trying to use GIFBUILDER from a BE module to pre-generate some
images that are going to be used later on the website.

The problem is that when I try to create an object of "tslib_gifbuilder"
I need to do a require_once, as usually, but it doesn't work:
require_once(t3lib_extMgm::extPath('cms').'tslib/class.tslib_gifbuilder.php');
$gifCreator = t3lib_div::makeInstance('tslib_gifbuilder');

And I get the next error, just at require_once line:
Fatal error: Class 't3lib_stdGraphic' not found
in /var/www/mywebsite/typo3_src-4.1/typo3/sysext/cms/tslib/class.tslib_gifbuilder.php on line 102

I don't see anything wrong in my code, but maybe it's not possible to
create an instance of this class at backend.

Any idea about that?

Thank you very much,
   Rego

-- 
Manuel Rego Casasnovas
Computer Science Engineer
mailto:mrego at igalia.com
Tel: +34 986 10 76 10
Fax: +34 981 91 39 49
Igalia - http://www.igalia.com