Fix xen build

with -Werror=incompatible-pointer-types and
-Werror=implicit-function-declaration.

1 files changed, 1 insertions, 0 deletions

diff --git a/xen/xen.h b/xen/xen.h
index 3fd4028a..30bd8dfe 100644
--- a/xen/xen.h
+++ b/xen/xen.h
@@ -24,6 +24,7 @@ void hyp_dev_init(void);
 void hyp_idle(void);
 void hyp_p2m_init(void);
 
+struct i386_interrupt_state;
 void hypclock_machine_intr(int old_ipl, void *ret_addr, struct i386_interrupt_state *regs, uint64_t delta);
 
 struct failsafe_callback_regs {