note 57094 added to function.imagecreate

I installed the package php4-imagick however still the error persists: Fatal error: Call to undefined function: imagecreate() in /var/www/html/moodle/lib/graphlib.php on line 1429 What I can make pra to correct? thank´s! ---- Manual Page -- http://www.php.net/manual/en/function.imagecreate.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57094 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57094&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57094&report=yes Search -- http://master.php.net/manage/user-notes.php