--- 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>