diff -NrU5 tesseract-2.04.original/viewer/svutil.cpp tesseract-2.04/viewer/svutil.cpp
--- tesseract-2.04.original/viewer/svutil.cpp	2009-07-25 21:03:18.000000000 +0000
+++ tesseract-2.04/viewer/svutil.cpp	2009-07-25 21:05:54.000000000 +0000
@@ -41,10 +41,11 @@
 #include <sys/prctl.h>
 #endif
 #endif
 
 #include <iostream>
+#include <cstdio>
 
 const int kBufferSize = 65536;
 const int kMaxMsgSize = 4096;
 
 // Signals a thread to exit.