Fix g++ 4.7 build failure Kudos to Matthias Klose for the patch Index: libmsn-4.2/msn/util.cpp =================================================================== --- libmsn-4.2.orig/msn/util.cpp 2009-07-22 19:57:10.000000000 +0000 +++ libmsn-4.2/msn/util.cpp 2012-04-16 20:52:18.068767213 +0000 @@ -25,6 +25,7 @@ #include <msn/util.h> #include <sstream> #include <errno.h> +#include <unistd.h> #include <cctype> #include <fstream> #include <openssl/rand.h>