diff -urN 2.4.9-wt1/include/linux/perfctr.h linux-2.4.9-wt1/include/linux/perfctr.h
--- 2.4.9-wt1/include/linux/perfctr.h	Sun Sep 23 20:07:43 2001
+++ linux-2.4.9-wt1/include/linux/perfctr.h	Sun Sep 23 20:08:47 2001
@@ -5,6 +5,7 @@
  */
 #ifndef _LINUX_PERFCTR_H
 #define _LINUX_PERFCTR_H
+#ifdef CONFIG_KPERFCTR
 
 #include <asm/perfctr.h>
 
@@ -216,5 +217,5 @@
 #endif	/* CONFIG_PERFCTR_VIRTUAL */
 
 #endif	/* __KERNEL__ */
-
+#endif	/* CONFIG_KPERFCTR */
 #endif	/* _LINUX_PERFCTR_H */
diff -urN 2.4.9-wt1/kernel/timer.c linux-2.4.9-wt1/kernel/timer.c
--- 2.4.9-wt1/kernel/timer.c	Sun Sep 23 20:03:23 2001
+++ linux-2.4.9-wt1/kernel/timer.c	Sun Sep 23 20:10:32 2001
@@ -610,7 +610,9 @@
 	do_process_times(p, user, system);
 	do_it_virt(p, user);
 	do_it_prof(p);
+#ifdef	CONFIG_KPERFCTR
 	perfctr_sample_thread(&p->thread);
+#endif	/* CONFIG_KPERFCTR */
 }	
 
 /*