Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision 26aafe8d909ecb61306a77910aeb374da3814391)
+++ kernel/generic/include/proc/thread.h	(revision 0eff68e2235e2f4737160b4f06cd3e6c1b217a5e)
@@ -258,4 +258,5 @@
 extern sysarg_t sys_thread_get_id(thread_id_t *);
 extern sysarg_t sys_thread_usleep(uint32_t);
+extern sysarg_t sys_thread_udelay(uint32_t);
 
 #endif