diff -urpN linux-2.6.16-rc1-mm4.org/drivers/net/wireless/tiacx.org/acx_struct.h linux-2.6.16-rc1-mm4.org/drivers/net/wireless/tiacx/acx_struct.h
--- linux-2.6.16-rc1-mm4.org/drivers/net/wireless/tiacx.org/acx_struct.h	Tue Jan 31 12:13:53 2006
+++ linux-2.6.16-rc1-mm4.org/drivers/net/wireless/tiacx/acx_struct.h	Tue Jan 31 13:51:18 2006
@@ -121,6 +121,10 @@ enum { acx_debug = 0 };
 #define DEVTYPE_PCI		0
 #define DEVTYPE_USB		1
 
+#if !defined(CONFIG_ACX_PCI) && !defined(CONFIG_ACX_USB)
+#error Driver must include PCI and/or USB support. You selected neither.
+#endif
+
 #if defined(CONFIG_ACX_PCI)
  #if !defined(CONFIG_ACX_USB)
   #define IS_PCI(priv)	1