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diff --git a/dummynet2/include/sys/systm.h b/dummynet2/include/sys/systm.h
new file mode 100644
index 0000000..238a7d3
--- /dev/null
+++ b/dummynet2/include/sys/systm.h
@@ -0,0 +1,73 @@
+#ifndef _SYS_SYSTM_H_
+#define _SYS_SYSTM_H_
+
+#ifndef _WIN32	/* this is the linux version */
+/* callout support, in <sys/callout.h> on FreeBSD */
+/*
+ * callout support on linux module is done using timers
+ */
+#include <linux/timer.h>
+#ifdef LINUX_24
+#include <linux/sched.h>        /* jiffies definition is here in 2.4 */
+#endif
+#define callout timer_list
+static __inline int
+callout_reset(struct callout *co, int ticks, void (*fn)(void *), void *arg)
+{
+        co->expires = jiffies + ticks;
+        co->function = (void (*)(unsigned long))fn;
+        co->data = (unsigned long)arg;
+        add_timer(co);
+        return 0;
+}
+
+#define callout_init(co, safe)  init_timer(co)
+#define callout_drain(co)       del_timer(co)
+#define callout_stop(co)        del_timer(co)
+
+#define CALLOUT_ACTIVE          0x0002 /* callout is currently active */
+#define CALLOUT_MPSAFE          0x0008 /* callout handler is mp safe */
+
+#else /* _WIN32 */
+
+/* This is the windows part for callout support */
+struct callout {
+	int dummy;
+};
+static __inline int
+callout_reset(struct callout *co, int ticks, void (*fn)(void *), void *arg)
+{
+	return 0;
+}
+
+#define callout_init(co, safe)
+#define callout_drain(co)
+#define callout_stop(co)
+#endif /* !_WIN32 */
+
+
+#if 0
+/* add out timer to the kernel global timer list */
+NTSTATUS 
+  IoInitializeTimer(
+    IN PDEVICE_OBJECT  DeviceObject,
+    IN PIO_TIMER_ROUTINE  TimerRoutine,
+    IN PVOID  Context
+    );
+
+/* see differences :
+IoInitializeDpcRequest
+	http://dsrg.mff.cuni.cz/~ceres/sch/osy/text/ch04s01s01.php
+	example http://www.beyondlogic.org/interrupts/winnt_isr_dpc.htm
+KeInitializeDpc  IRQL: Any level
+IoInitializeTimer IRQL: Passive level
+KeInitializeTimer */
+VOID 
+  KeInitializeDpc(
+    IN PRKDPC  Dpc,
+    IN PKDEFERRED_ROUTINE  DeferredRoutine,
+    IN PVOID  DeferredContext
+    );
+#endif /* commented out */ 
+
+#endif /* _SYS_SYSTM_H_ */