--- tesseract-3.00/viewer/svutil.cpp.old	2012-04-11 09:34:26.168608940 +0200
+++ tesseract-3.00/viewer/svutil.cpp	2012-04-11 09:34:46.108565692 +0200
@@ -21,6 +21,7 @@
 // thread/process creation & synchronization and network connection.
 
 #include <stdio.h>
+#include <unistd.h>
 #ifdef WIN32
 #include <windows.h>
 #include <winsock.h>
