Index: madwifi-ng-r2537-20070704/ath/if_athvar.h
===================================================================
--- madwifi-ng-r2537-20070704.orig/ath/if_athvar.h	2007-07-07 11:28:00.232371000 +0200
+++ madwifi-ng-r2537-20070704/ath/if_athvar.h	2007-07-07 11:28:09.784968000 +0200
@@ -118,6 +118,11 @@
 #define ATH_GET_NETDEV_DEV(ndev)	((ndev)->class_dev.dev)
 #endif
 
+#ifndef NETDEV_TX_OK
+#define NETDEV_TX_OK    0
+#define NETDEV_TX_BUSY  1
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,23)
 static inline struct net_device *_alloc_netdev(int sizeof_priv, const char *mask,
 					       void (*setup)(struct net_device *))