--- xsim/im.cpp.orig	Sat Aug 16 16:31:04 2003
+++ xsim/im.cpp	Sat Aug 16 16:31:11 2003
@@ -16,6 +16,7 @@
 	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+#include <cassert>
 #include <dlfcn.h>
 
 #include "im.h"