Work done on the plane, ready to release libxml2-2.0.0, Daniel
diff --git a/tree.h b/tree.h
index c881728..a755962 100644
--- a/tree.h
+++ b/tree.h
@@ -11,6 +11,7 @@
 #define __XML_TREE_H__
 
 #include <stdio.h>
+#include <libxml/xmlversion.h>
 
 
 #ifdef __cplusplus