--- ../busybox-1.23.2.orig/util-linux/mdev.c	2015-03-23 06:07:19.000000000 +0300
+++ ./util-linux/mdev.c	2015-09-26 01:26:04.892390824 +0300
@@ -1134,3 +1134,14 @@
 
 	return EXIT_SUCCESS;
 }
+
+#include <errno.h>
+#include <signal.h>
+
+int
+sigtimedwait (const sigset_t *set, siginfo_t *info,
+		const struct timespec *timeout)
+{
+  __set_errno (ENOSYS);
+  return -1;
+}