model: include <cstddef>

NULL is not a builtin keyword in recent C++ revisions. I have to include
<cstddef>.

diff --git a/model.h b/model.h
index 117c64588a3889b9c036865228c6512d93c6d0cf..54144f38fc322df9a79edf2e8d0c542f25d027d8 100644 (file)
--- a/model.h
+++ b/model.h
@@ -3,6 +3,7 @@
 
 #include <list>
 #include <map>
+#include <cstddef>
 
 #include "schedule.h"
 #include "libthreads.h"