--- OLD/xc/programs/x11perf/do_tris.c	Thu Jan  1 00:00:00 1970
+++ NEW/xc/programs/x11perf/do_tris.c	Thu Jan  1 00:00:00 1970
@@ -22,6 +22,7 @@
 
 ******************************************************************************/
 
+#include <stdlib.h>
 
 #undef POLYTRIANGLE_HACK    /* don't use this code */
 #ifdef POLYTRIANGLE_HACK