--- iPE.xs.orig	2022-08-03 15:24:21.000000000 -0700
+++ iPE.xs	2022-08-03 15:24:47.000000000 -0700
@@ -2,6 +2,7 @@
 #include "perl.h" 
 #include "XSUB.h" 
 #include "bntree.h"
+#include "training.h"
 
 MODULE = iPE PACKAGE = iPE