Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision 26aafe8d909ecb61306a77910aeb374da3814391)
+++ kernel/generic/include/proc/thread.h	(revision 764d71e80b7c72cc3d48b7d5d789623dd67c6961)
@@ -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