Some uClinux architectures do not define pivot_root

libc/sysdeps/linux/common/pivot_root.c

@@ -2,10 +2,19 @@
 /*
  * pivot_root() for uClibc
  *
- * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
  *
  * GNU Library General Public License (LGPL) version 2 or later.
  */
 
 #include "syscalls.h"
+
+#ifdef __NR_pivot_root
 _syscall2(int, pivot_root, const char *, new_root, const char *, put_old);
+#else
+int pivot_root(const char *new_root, const char *put_old)
+{
+	__set_errno(ENOSYS);
+	return -1;
+}
+#endif