diff -Naur OpenImageIO-oiio-7b7590f.orig/src/include/strutil.h OpenImageIO-oiio-7b7590f/src/include/strutil.h
--- OpenImageIO-oiio-7b7590f.orig/src/include/strutil.h	2011-11-20 09:23:48.000000000 -0600
+++ OpenImageIO-oiio-7b7590f/src/include/strutil.h	2012-01-05 14:30:34.015046609 -0600
@@ -44,6 +44,7 @@
 #include <string>
 #include <cstring>
 #include <map>
+#include <unistd.h>
 
 #include "export.h"
 #include "version.h"