--- a/libmsn-4.2.1/msn/util.cpp	2009-07-22 15:57:10.000000000 -0400
+++ b/libmsn-4.2.1/msn/util.cpp	2012-12-16 13:06:58.150627183 -0500
@@ -25,6 +25,7 @@
 #include <msn/util.h>
 #include <sstream>
 #include <errno.h>
+#include <unistd.h>
 #include <cctype>
 #include <fstream>
 #include <openssl/rand.h>