--- src/Network/nmea.cxx.orig	2012-04-29 11:44:11.629236922 +0300
+++ src/Network/nmea.cxx	2012-04-29 11:44:22.384235831 +0300
@@ -24,6 +24,7 @@
 #  include "config.h"
 #endif
 
+#include <cstdlib>
 #include <cstring>
 
 #include <simgear/debug/logstream.hxx>