Ticket #10867: patch for not able to use next_post_link and previous_post_link on index page.diff

(a) link-template.php vs. (b) (current

@@ -864 +864 @@
 function get_adjacent_post($in_same_cat = false, $excluded_categories = '', $previous = true) {
         global $post, $wpdb;
 
-        if ( empty($post) || !is_single() || is_attachment() )
+        if ( empty($post) || is_attachment() )
                 return null;
 
         $current_post_date = $post->post_date;