diff -up centerim-4.22.10/libicq2000/libicq2000/sigslot.h.orig centerim-4.22.10/libicq2000/libicq2000/sigslot.h
--- centerim-4.22.10/libicq2000/libicq2000/sigslot.h.orig 2011-07-01 18:30:14.000000000 +0200
+++ centerim-4.22.10/libicq2000/libicq2000/sigslot.h 2011-07-01 18:33:37.000000000 +0200
@@ -82,6 +82,7 @@
#ifndef SIGSLOT_H__
#define SIGSLOT_H__
+#include <cstddef>
#include <set>
#include <list>