include sys/time.h for systems that don't include it automatically
diff --git a/include/plist/Date.h b/include/plist/Date.h
index 4aea507..ea0b270 100644
--- a/include/plist/Date.h
+++ b/include/plist/Date.h
@@ -24,6 +24,7 @@
 
 #include <plist/Node.h>
 #include <ctime>
+#include <sys/time.h>
 
 namespace PList
 {