+#if LINUX_VERSION_CODE < VERSION(2,1,57)
+#define signal_pending(p) ((p)->signal & ~(p)->blocked)
+#endif
+
+#if LINUX_VERSION_CODE < VERSION(2,1,25)
+#define net_device_stats enet_statistics
+#endif
+
+#if LINUX_VERSION_CODE < VERSION(2,1,60)
+typedef int rw_ret_t;
+typedef unsigned int rw_count_t;
+#else
+typedef ssize_t rw_ret_t;
+typedef size_t rw_count_t;
+#endif
+