--- cheesetracker-0.9.15.3.orig/cheesetracker/trackercore/voice_control.cpp
+++ cheesetracker-0.9.15.3/cheesetracker/trackercore/voice_control.cpp
@@ -16,6 +16,7 @@
 
 #include "voice_control.h"
 #include "freq_conversion.h"
+#include <stdlib.h>
 
 
 #define PAN_SURROUND 512