diff -Naur ctl-1.4.1.orig/IlmCtl/CtlInterpreter.cpp ctl-1.4.1/IlmCtl/CtlInterpreter.cpp
--- ctl-1.4.1.orig/IlmCtl/CtlInterpreter.cpp 2006-12-14 23:43:55.000000000 +0100
+++ ctl-1.4.1/IlmCtl/CtlInterpreter.cpp 2012-01-19 04:49:14.150570152 +0100
@@ -65,6 +65,8 @@
#include <algorithm>
#include <cassert>
+#include <unistd.h>
+
#ifdef WIN32
#include <io.h>
#include <stdio.h>