--- a/targets/Linux/plc_Linux_main.c	Thu Feb 24 15:54:45 2011 +0100
+++ b/targets/Linux/plc_Linux_main.c	Wed Mar 16 17:26:54 2011 +0100
@@ -206,6 +206,14 @@
 	return 1;
 }
 
+void ValidateRetainBuffer(void)
+{
+}
+
+void InValidateRetainBuffer(void)
+{
+}
+
 void Retain(unsigned int offset, unsigned int count, void *p)
 {
 }