--- flag_content_orig/flag_content.install	2008-03-11 22:44:31.000000000 -0500
+++ flag_content/flag_content.install	2008-03-12 16:12:10.000000000 -0500
@@ -68,4 +68,10 @@ function flag_content_update_2() {
 
 function flag_content_uninstall() {
   db_query("DROP TABLE {flag_content}");
+	// Remove variables
+	db_query('DELETE FROM {variable} WHERE name LIKE "flag_content_node_type_%"');
+	variable_del('flag_content_email');
+	variable_del('flag_content_user');
+	variable_del('flag_content_comment');
+	cache_clear_all('*', 'cache', TRUE);
 }