diff -u deltup-0.4.4.old/tmpstore.cpp deltup-0.4.4/tmpstore.cpp
--- deltup-0.4.4.old/tmpstore.cpp	2007-03-24 23:45:29.000000000 +0100
+++ deltup-0.4.4/tmpstore.cpp	2012-08-11 14:45:31.380739060 +0200
@@ -19,6 +19,7 @@
 using namespace std;
 #include "file.h"
 #include "system.h"
+#include "unistd.h"
 #include <openssl/md5.h>
 
 string tmpdir;