Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision 9718692956e76525b421c8895899cd78e78063fd)
+++ kernel/generic/include/proc/thread.h	(revision 5fd3f2d54a5ccebad2edc13fe02afe1bbcac252f)
@@ -259,4 +259,5 @@
 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