--- blackbox-0.65.0/src/Window.cc.orig	Tue Sep 17 15:23:35 2002
+++ blackbox-0.65.0/src/Window.cc	Wed Jun 11 11:17:15 2003
@@ -44,6 +44,8 @@
 #endif // HAVE_STDLIB_H
 }
 
+#include <assert.h>
+
 #include "i18n.hh"
 #include "blackbox.hh"
 #include "GCCache.hh"