--- OLD/xc/programs/x11perf/do_traps.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/x11perf/do_traps.c	Thu Jan  1 00:00:00 1970
@@ -22,6 +22,8 @@
 
 ******************************************************************************/
 
+#include <stdlib.h>
+
 #include "x11perf.h"
 #include "bitmaps.h"