diff -urp ../htmlpurifier/htmlpurifier.info ./htmlpurifier.info
--- ../htmlpurifier/htmlpurifier.info	2009-12-13 03:30:38.000000000 +0200
+++ ./htmlpurifier.info	2010-02-08 17:11:55.562417000 +0200
@@ -3,6 +3,7 @@ name = "HTML Purifier"
 description = "Filter that removes malicious HTML and ensures standards compliant output."
 core = 6.x
 php = 5.0.5
+dependencies[] = libraries
 
 ; Information added by drupal.org packaging script on 2009-12-13
 version = "6.x-2.1"
diff -urp ../htmlpurifier/htmlpurifier.install ./htmlpurifier.install
--- ../htmlpurifier/htmlpurifier.install	2009-10-22 18:40:01.000000000 +0300
+++ ./htmlpurifier.install	2010-02-08 19:09:31.065630000 +0200
@@ -38,11 +38,16 @@ function htmlpurifier_requirements($phas
   // This version of HTML Purifier is required
   static $req_version = '4.0.0';
   $requirements = array();
-  
-  // Can't use drupal_get_path, since module may not have been installed.
-  $module_path = dirname(__FILE__);
+
+  // Make sure libraries_get_path available
+  if (!function_exists('libraries_get_path')) {
+    // Can't use drupal_get_path, since module may not have been installed.
+    require_once dirname(__FILE__) . '/../libraries/libraries.module';
+  }
+
+  $library_path = libraries_get_path('htmlpurifier');
   $s = DIRECTORY_SEPARATOR;
-  if (!file_exists("$module_path/library/HTMLPurifier.auto.php")) {
+  if (!file_exists("$library_path/library/HTMLPurifier.auto.php")) {
     $requirements['htmlpurifier'] = array (
       'severity' => REQUIREMENT_ERROR,
       'description' => t("Could not find HTML Purifier
@@ -50,12 +55,12 @@ function htmlpurifier_requirements($phas
           of the library folder in the HTML Purifier tarball or zip
           to this folder or ensure HTMLPurifier.auto.php exists.
           You can download HTML Purifier at
-          <a href=\"http://htmlpurifier.org/download.html\">htmlpurifier.org</a>.", array('@path' => "$module_path{$s}library")
+          <a href=\"http://htmlpurifier.org/download.html\">htmlpurifier.org</a>.", array('@path' => "$library_path{$s}library")
       ),
     );
   }
   else {
-    require_once "$module_path/library/HTMLPurifier.auto.php";
+    require_once "$library_path/library/HTMLPurifier.auto.php";
     if (!defined('HTMLPurifier::VERSION') || version_compare($old = HTMLPurifier::VERSION, $req_version, '<')) {
 
       $requirements['htmlpurifier'] = array (
Only in ./: htmlpurifier-library.patch
diff -urp ../htmlpurifier/htmlpurifier.module ./htmlpurifier.module
--- ../htmlpurifier/htmlpurifier.module	2009-12-13 03:10:18.000000000 +0200
+++ ./htmlpurifier.module	2010-02-08 17:15:30.925618000 +0200
@@ -157,7 +157,8 @@ function _htmlpurifier_process($text, $f
 function _htmlpurifier_load() {
   if (class_exists('HTMLPurifier')) return;
   $module_path = drupal_get_path('module', 'htmlpurifier');
-  require_once "$module_path/library/HTMLPurifier.auto.php";
+  $library_path = libraries_get_path('htmlpurifier');
+  require_once "$library_path/library/HTMLPurifier.auto.php";
   require_once "$module_path/HTMLPurifier_DefinitionCache_Drupal.php";
   $factory = HTMLPurifier_DefinitionCacheFactory::instance();
   $factory->register('Drupal', 'HTMLPurifier_DefinitionCache_Drupal');