Only in typo3/sysext/install_v2: ext_autoload.php.orig
diff -rux .svn typo3/sysext/install/updates/class.tx_coreupdates_addflexformstoacl.php typo3/sysext/install_v2/updates/class.tx_coreupdates_addflexformstoacl.php
--- typo3/sysext/install/updates/class.tx_coreupdates_addflexformstoacl.php	2011-01-04 14:39:50.000000000 -0600
+++ typo3/sysext/install_v2/updates/class.tx_coreupdates_addflexformstoacl.php	2011-01-04 14:36:09.000000000 -0600
@@ -31,28 +31,8 @@
  *
  * @author Kai Vogel <kai.vogel(at)speedprogs.de>
  */
-class tx_coreupdates_addflexformstoacl {
-
-	/**
-	 * TYPO3 version number
-	 *
-	 * @var integer
-	 */
-	public $versionNumber = 0;
-
-	/**
-	 * Reference to parent object (tx_install)
-	 *
-	 * @var object
-	 */
-	public $pObj = NULL;
-
-	/**
-	 * User input
-	 *
-	 * @var array
-	 */
-	public $userInput = array();
+class tx_coreupdates_addflexformstoacl extends Tx_Install_Updates_Base {
+	protected $title = 'Add Excludable FlexForm Fields to Group Access Lists';
 
 	/**
 	 * Checks if FlexForm fields are missing in group access lists.
@@ -62,15 +42,11 @@
 	 */
 	public function checkForUpdate(&$description) {
 		$description = '
-			<br />TYPO3 4.5 introduced the possibility to exclude FlexForm fields like normal fields in group access lists (ACL).
-			All excludeable fields will be hidden for non-admins if you do not add them to the ACL of each user group.
+			<br />TYPO3 4.5 introduced the possibility to exclude FlexForm fields like normal fields in group access control lists (ACL).
+			All excludeable fields will be hidden for non-admins if you do not add them to the ACL of each user group manually or with 
+			this update wizard.
 		';
 
-			// Update is only required in TYPO3 version 4.5 and above
-		if (empty($this->versionNumber) || $this->versionNumber < 4005000) {
-			return FALSE;
-		}
-
 			// Check access lists
 		if (!$this->getGroupAddFields()) {
 			return FALSE;
@@ -87,8 +63,8 @@
 	 */
 	public function getUserInput($inputPrefix) {
 		$description = '
-			<strong>Add excludeable FlexForm fields to group access lists (ACL)</strong>
-			<br />You are about to update all group access lists.
+			<br />You are about to update group access control lists to include excludable FlexForm fields. Each backend group will be checked
+			and only those that already have entries in the access control lists will be updated.
 		';
 
 		return $description;
@@ -102,11 +78,6 @@
 	 * @return boolean Whether update was successful or not
 	 */
 	public function performUpdate(array &$dbQueries, &$customMessages) {
-			// Update is only required in TYPO3 version 4.5 and above
-		if (empty($this->versionNumber) || $this->versionNumber < 4005000) {
-			return FALSE;
-		}
-
 			// Get additional FlexForm fields for group access lists
 		$addFields = $this->getGroupAddFields();
 		if (empty($addFields)) {
@@ -146,9 +117,9 @@
 		if (!empty($flexFormArray)  && is_array($flexFormArray)) {
 			foreach ($flexFormArray as $tableField => $flexForms) {
 					// Get all sheets
-				foreach ($flexForms as $extIdent => $extConf) {
+				foreach ($flexForms as $flexFormIdentifier => $flexFormConfig) {
 						// Get all excludeable fields in sheet
-					foreach ($extConf['ds']['sheets'] as $sheetName => $sheet) {
+					foreach ($flexFormConfig['ds']['sheets'] as $sheetName => $sheet) {
 						if (empty($sheet['ROOT']['el']) || !is_array($sheet['ROOT']['el'])) {
 							continue;
 						}
@@ -156,7 +127,7 @@
 							if (empty($field['TCEforms']['exclude'])) {
 								continue;
 							}
-							$flexExcludeFields[] = $contentTable . ':' . $tableField . ';' . $extIdent . ';' . $sheetName . ';' . $fieldName;
+							$flexExcludeFields[] = $contentTable . ':' . $tableField . ';' . $flexFormIdentifier . ';' . $sheetName . ';' . $fieldName;
 						}
 					}
 				}
@@ -172,7 +143,7 @@
 			if (empty($nonExcludeFields)) {
 				continue;
 			}
-				// Add FlexForm fields only if no one was already selected by a user
+				// Add FlexForm fields only if the field was not already selected by a user
 			$nonExcludeFields = array_diff($flexExcludeFields, $nonExcludeFields);
 			if (!empty($nonExcludeFields) && $nonExcludeFields == $flexExcludeFields) {
 				$addFields[$accessList['uid']] = $nonExcludeFields;
@@ -193,11 +164,11 @@
 	protected function updateGroupAccessLists(array $addFields, array &$dbQueries, &$customMessages) {
 		foreach ($addFields as $groupUID => $flexExcludeFields) {
 				// First get current fields
-			$result = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows('non_exclude_fields', 'be_groups', 'uid=' . (int) $groupUID);
-			if (!isset($result[0]['non_exclude_fields'])) {
+			$result = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('non_exclude_fields', 'be_groups', 'uid=' . (int) $groupUID);
+			if (!isset($result['non_exclude_fields'])) {
 				continue;
 			}
-			$nonExcludeFields = $result[0]['non_exclude_fields'];
+			$nonExcludeFields = $result['non_exclude_fields'];
 
 				// Now add new ones
 			$flexExcludeFields = implode(',', $flexExcludeFields);