--- linux-2.4.22-rc1-ac1-orig/arch/i386/kernel/setup.c	Fri Aug  8 22:34:38 2003
+++ linux-2.4.22-rc1-ac1-fixed/arch/i386/kernel/setup.c	Sat Aug  9 00:41:01 2003
@@ -2978,7 +2978,9 @@
 	 * applications want to get the raw CPUID data, they should access
 	 * /dev/cpu/<cpu_nr>/cpuid instead.
 	 */
+#ifdef CONFIG_SMP
 	extern	int phys_proc_id[NR_CPUS];
+#endif
 	static char *x86_cap_flags[] = {
 		/* Intel-defined */
 	        "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",