--- httpd-2.2.6-r2.orig/modules/mappers/mod_dir.c	2007-11-30 20:02:53.000000000 +0100
+++ httpd-2.2.6-r2/modules/mappers/mod_dir.c	2007-11-30 19:37:18.000000000 +0100
@@ -39,19 +39,69 @@
 
 typedef struct dir_config_struct {
     apr_array_header_t *index_names;
+    apr_array_header_t *index_names_base;
+    apr_array_header_t *index_names_incr;
     slash_cfg do_slash;
 } dir_config_rec;
 
 #define DIR_CMD_PERMS OR_INDEXES
 
+static void update_index(dir_config_rec *d, apr_pool_t *p)
+{
+    if ((!d->index_names_base) && (!d->index_names_incr))
+    {
+        if (d->index_names)
+        {
+            // clear old entries
+            while (apr_array_pop(d->index_names))
+                ;
+            // I think it should be freed, but I don't know how
+            d->index_names = NULL;
+        }
+
+        return;
+    }
+
+    if (d->index_names)
+        // clear old entries
+        while (apr_array_pop(d->index_names))
+            ;
+    else
+        // allocate
+        d->index_names = apr_array_make(p, 2, sizeof(char *));
+
+    if (d->index_names_base)
+        apr_array_cat(d->index_names, d->index_names_base);
+
+    if (d->index_names_incr)
+        apr_array_cat(d->index_names, d->index_names_incr);
+}
+
 static const char *add_index(cmd_parms *cmd, void *dummy, const char *arg)
 {
     dir_config_rec *d = dummy;
 
-    if (!d->index_names) {
-        d->index_names = apr_array_make(cmd->pool, 2, sizeof(char *));
+    if (!d->index_names_base) {
+        d->index_names_base = apr_array_make(cmd->pool, 2, sizeof(char *));
     }
-    *(const char **)apr_array_push(d->index_names) = arg;
+    *(const char **)apr_array_push(d->index_names_base) = arg;
+
+    update_index(d, cmd->pool);
+
+    return NULL;
+}
+
+static const char *add_index_incr(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    dir_config_rec *d = dummy;
+
+    if (!d->index_names_incr) {
+        d->index_names_incr = apr_array_make(cmd->pool, 2, sizeof(char *));
+    }
+    *(const char **)apr_array_push(d->index_names_incr) = arg;
+
+    update_index(d, cmd->pool);
+
     return NULL;
 }
 
@@ -67,6 +117,8 @@
 {
     AP_INIT_ITERATE("DirectoryIndex", add_index, NULL, DIR_CMD_PERMS,
                     "a list of file names"),
+    AP_INIT_ITERATE("AddDirectoryIndex", add_index_incr, NULL, DIR_CMD_PERMS,
+                    "a list of file names"),
     AP_INIT_FLAG("DirectorySlash", configure_slash, NULL, DIR_CMD_PERMS,
                  "On or Off"),
     {NULL}
@@ -77,17 +129,38 @@
     dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec));
 
     new->index_names = NULL;
+    new->index_names_base = NULL;
+    new->index_names_incr = NULL;
     new->do_slash = SLASH_UNSET;
     return (void *) new;
 }
 
 static void *merge_dir_configs(apr_pool_t *p, void *basev, void *addv)
 {
-    dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec));
+    dir_config_rec *new = (dir_config_rec *)create_dir_config(p, NULL);
     dir_config_rec *base = (dir_config_rec *)basev;
     dir_config_rec *add = (dir_config_rec *)addv;
 
-    new->index_names = add->index_names ? add->index_names : base->index_names;
+    if (add->index_names_base)
+        new->index_names_base = add->index_names_base;
+    else
+        new->index_names_base = base->index_names_base;
+
+    if ((!add->index_names_base) && base->index_names_incr)
+    {
+        new->index_names_incr = apr_array_make(p, 2, sizeof(char *));
+        apr_array_cat(new->index_names_incr, base->index_names_incr);
+    }
+
+    if (add->index_names_incr)
+    {
+        if (!new->index_names_incr)
+            new->index_names_incr = apr_array_make(p, 2, sizeof(char *));
+        apr_array_cat(new->index_names_incr, add->index_names_incr);
+    }
+
+    update_index(new, p);
+
     new->do_slash =
         (add->do_slash == SLASH_UNSET) ? base->do_slash : add->do_slash;
     return new;