Unless sched.h is included, collectd's cpu module falls back to using local
definitions of CPUSTATES and related macros which no longer match ones used
by the kernel.

Index: src/cpu.c
--- src/cpu.c.orig
+++ src/cpu.c
@@ -63,6 +63,10 @@
 #include <sys/sysctl.h>
 #endif
 
+#ifdef HAVE_SYS_SCHED_H
+#include <sys/sched.h>
+#endif
+
 #ifdef HAVE_SYS_DKSTAT_H
 /* implies BSD variant */
 #include <sys/dkstat.h>