--- centerim-4.22.10.orig/libicq2000/libicq2000/sigslot.h
+++ centerim-4.22.10/libicq2000/libicq2000/sigslot.h
@@ -82,6 +82,7 @@
 #ifndef SIGSLOT_H__
 #define SIGSLOT_H__
 
+#include <stddef.h>
 #include <set>
 #include <list>