Index: pingback.install
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/pingback/pingback.install,v
retrieving revision 1.3
diff -u -p -r1.3 pingback.install
--- pingback.install	15 Mar 2008 00:30:32 -0000	1.3
+++ pingback.install	13 Aug 2008 18:48:11 -0000
@@ -49,4 +49,17 @@ function pingback_install() {
 function pingback_uninstall() {
   // Drop my tables.
   drupal_uninstall_schema('pingback');
-}
\ No newline at end of file
+
+  // Clear any variables that might be in use
+  $variables = array(
+    'pingback_input_format',
+    'pingback_hide_format_for_anon',
+    'pingback_receive',
+    'pingback_mode',
+    'pingback_check_per_cron',
+    'pingback_notify_successful_pings',
+  );
+  foreach ($variables as $variable) {
+    variable_del($variable);
+  }
+}