--- a/targets/Linux/plc_Linux_main.c	Fri Mar 13 17:19:58 2015 +0100
+++ b/targets/Linux/plc_Linux_main.c	Fri Mar 13 22:36:52 2015 +0100
@@ -232,6 +232,14 @@
     pthread_mutex_lock(&python_mutex);
 }
 
+void InitRetain(void)
+{
+}
+
+void CleanupRetain(void)
+{
+}
+
 int CheckRetainBuffer(void)
 {
 	return 1;