--- linux-2.6.5-rc3/include/asm-i386/acpi.h.org	2004-04-02 09:40:31.000000000 +0200
+++ linux-2.6.5-rc3/include/asm-i386/acpi.h	2004-04-02 10:14:29.589094968 +0200
@@ -26,6 +26,8 @@
 #ifndef _ASM_ACPI_H
 #define _ASM_ACPI_H
 
+#define CONFIG_X86_CMPXCHG 1
+
 #ifdef __KERNEL__
 
 #include <asm/system.h>		/* defines cmpxchg */