diff -up Horde_Autoloader-2.0.1/lib/Horde/Autoloader/Default.php.fedora Horde_Autoloader-2.0.1/lib/Horde/Autoloader/Default.php
--- Horde_Autoloader-2.0.1/lib/Horde/Autoloader/Default.php.fedora	2012-11-19 14:12:28.000000000 +0100
+++ Horde_Autoloader-2.0.1/lib/Horde/Autoloader/Default.php	2014-02-20 11:34:05.139297471 +0100
@@ -13,6 +13,7 @@
 require_once 'Horde/Autoloader.php';
 require_once 'Horde/Autoloader/ClassPathMapper.php';
 require_once 'Horde/Autoloader/ClassPathMapper/Default.php';
+require_once 'Horde/Autoloader/ClassPathMapper/Prefix.php';
 
 class Horde_Autoloader_Default extends Horde_Autoloader
 {
@@ -25,6 +26,14 @@ class Horde_Autoloader_Default extends H
                 $this->addClassPathMapper(new Horde_Autoloader_ClassPathMapper_Default($path));
             }
         }
+        /* Ensure Sabre is taken from /usr/share/php, as /usr/share/pear may contains old version */
+        if (is_dir($sabre = '/usr/share/php/Sabre')) {
+            $this->addClassPathMapper(new Horde_Autoloader_ClassPathMapper_Prefix('/^Sabre\\\\/', $sabre));
+        }
+        /* Keep VObject from pear (v2.1), not ready for v3.1 */
+        if (is_dir($vobject = '/usr/share/pear/Sabre/VObject')) {
+            $this->addClassPathMapper(new Horde_Autoloader_ClassPathMapper_Prefix('/^Sabre\\\\VObject\\\\/', $vobject));
+        }
     }
 }