Fix build of the Transceiver.
diff --git a/Transceiver52M/radioVector.h b/Transceiver52M/radioVector.h
index 2975a73..8de4493 100644
--- a/Transceiver52M/radioVector.h
+++ b/Transceiver52M/radioVector.h
@@ -24,6 +24,7 @@
 
 #include "sigProcLib.h"
 #include "GSMCommon.h"
+#include "Interthread.h"
 
 class radioVector : public signalVector {
 public: