Index: putty.h
--- putty.h.orig
+++ putty.h
@@ -2126,6 +2126,7 @@ typedef enum NoiseSourceId {
     NOISE_SOURCE_THREADTIME,
     NOISE_SOURCE_PROCTIME,
     NOISE_SOURCE_PERFCOUNT,
+    NOISE_SOURCE_ARC4RANDOM,
     NOISE_MAX_SOURCES
 } NoiseSourceId;
 void noise_get_heavy(void (*func) (void *, int));