diff --git a/ChangeLog b/ChangeLog
index e54b306462..d9b9dc6345 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -44,6 +44,7 @@ phpMyAdmin - ChangeLog
 4.1.12.0 (not yet released)
 - bug #4334 Add event : datepicker won't open
 - bug #4338 Fix missing value error while executing SQL query
+- TCPDF library is now optional dependency
 
 4.1.11.0 (2014-03-23)
 - bug #4335 reCaptcha problem (4.1.10 regression) 
diff --git a/libraries/plugins/export/ExportPdf.class.php b/libraries/plugins/export/ExportPdf.class.php
index ffabb96efa..876f0700bb 100644
--- a/libraries/plugins/export/ExportPdf.class.php
+++ b/libraries/plugins/export/ExportPdf.class.php
@@ -10,6 +10,14 @@ if (! defined('PHPMYADMIN')) {
     exit;
 }
 
+/**
+ * Skip the plugin if TCPDF is not available.
+ */
+if (! file_exists(TCPDF_INC)) {
+    $GLOBALS['skip_import'] = true;
+    return;
+}
+
 /* Get the export interface */
 require_once 'libraries/plugins/ExportPlugin.class.php';
 /* Get the PMA_ExportPdf class */
@@ -265,4 +273,4 @@ class ExportPdf extends ExportPlugin
         $this->_pdfReportTitle = $pdfReportTitle;
     }
 }
-?>
\ No newline at end of file
+?>
diff --git a/libraries/schema/Pdf_Relation_Schema.class.php b/libraries/schema/Pdf_Relation_Schema.class.php
index f170ce959c..2272303e32 100644
--- a/libraries/schema/Pdf_Relation_Schema.class.php
+++ b/libraries/schema/Pdf_Relation_Schema.class.php
@@ -9,6 +9,21 @@ if (! defined('PHPMYADMIN')) {
     exit;
 }
 
+/**
+ * Skip the plugin if TCPDF is not available.
+ */
+if (! file_exists(TCPDF_INC)) {
+    $GLOBALS['skip_import'] = true;
+    return;
+}
+
+/**
+ * block attempts to directly run this script
+ */
+if (getcwd() == dirname(__FILE__)) {
+    die('Attack stopped');
+}
+
 require_once 'Export_Relation_Schema.class.php';
 require_once './libraries/PDF.class.php';
 
diff --git a/libraries/schema/User_Schema.class.php b/libraries/schema/User_Schema.class.php
index b64898e3ad..968cf78cc5 100644
--- a/libraries/schema/User_Schema.class.php
+++ b/libraries/schema/User_Schema.class.php
@@ -419,12 +419,19 @@ class PMA_User_Schema
             $htmlString .= PMA_Util::getImage('b_views.png');
         }
 
+        /*
+         * TODO: This list should be generated dynamically based on list of
+         * available plugins.
+         */
         $htmlString .= __('Display relational schema')
             . ':'
             . '</legend>'
-            . '<select name="export_type" id="export_type">'
-            . '<option value="pdf" selected="selected">PDF</option>'
-            . '<option value="svg">SVG</option>'
+            . '<select name="export_type" id="export_type">';
+        if (file_exists(TCPDF_INC)) {
+            $htmlString .= '<option value="pdf" selected="selected">PDF</option>';
+        }
+        $htmlString .=
+            '<option value="svg">SVG</option>'
             . '<option value="dia">DIA</option>'
             . '<option value="eps">EPS</option>'
             . '</select>'
@@ -663,7 +670,15 @@ class PMA_User_Schema
                 __('File doesn\'t exist')
             );
         }
+        $GLOBALS['skip_import'] = false;
         include $filename;
+        if ( $GLOBALS['skip_import']) {
+            PMA_Export_Relation_Schema::dieSchema(
+                $_POST['chpage'],
+                $export_type,
+                __('Plugin is disabled')
+            );
+        }
         $class_name = 'PMA_' . $path . '_Relation_Schema';
         $obj_schema = new $class_name();
         $obj_schema->showOutput();