commit faabe1f90c142a5ea836884a04c0eef250e69f94
Author: Kalev Lember <kalev@smartlink.ee>
Date:   Fri Feb 4 12:17:05 2011 +0200

    Fix the build with GCC 4.6
    
    * sigc++/signal_base.h: Include <cstddef> for size_t.

diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
index 1638642..e43bd5e 100644
--- a/sigc++/signal_base.h
+++ b/sigc++/signal_base.h
@@ -21,6 +21,7 @@
 #ifndef _SIGC_SIGNAL_BASE_H_
 #define _SIGC_SIGNAL_BASE_H_
 
+#include <cstddef>
 #include <list>
 #include <sigc++config.h>
 #include <sigc++/type_traits.h>