--- kcompat.h.orig	2009-03-06 19:17:48.000000000 +0300
+++ kcompat.h	2009-03-06 19:18:07.000000000 +0300
@@ -1081,8 +1081,10 @@ static inline int _kc_skb_is_gso(const s
 #define RHEL_VERSION 0
 #endif
 #if (!(( RHEL_VERSION == 4 ) && ( RHEL_UPDATE >= 5 )))
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
 typedef irqreturn_t (*irq_handler_t)(int, void*, struct pt_regs *);
 #endif
+#endif
 typedef irqreturn_t (*new_handler_t)(int, void*);
 static inline irqreturn_t _kc_request_irq(unsigned int irq, new_handler_t handler, unsigned long flags, const char *devname, void *dev_id)
 #else /* 2.4.x */