diff -r 2d6f6cb24132 -r a75b808d653b src/tree.c
--- a/src/tree.c	Sun Sep 26 13:34:30 2021 +0200
+++ b/src/tree.c	Sun Sep 26 14:21:20 2021 +0200
@@ -27,3 +27,20 @@
  */
 
 #include "cx/tree.h"
+
+
+int cx_tree_add_node(void *node, ptrdiff_t loc_parent, ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node) {
+    return 1;
+}
+
+int cx_tree_add_child_node(
+        void *parent,
+        ptrdiff_t loc_parent,
+        ptrdiff_t loc_prev,
+        ptrdiff_t loc_next,
+        void **children_begin,
+        void **children_end,
+        void *new_node)
+{
+    return 1;
+}